I have used the phrase "you have bound us to you with a bond that can
never be broken" in a song.  I wish to find the origin of this phrase.
 Is it biblical in origin?.  It may have been used in the text of the
Mass readings.

The exact phrase is not found in the Bible, however it may have a
Biblical origin. In Numbers 30:2 the Bible says:

?If a man vow a vow unto the LORD, or swear an oath to bind his soul
with a bond; he shall not break his word, he shall do according to all
that proceedeth out of his mouth.?

tutuzdad-ga

There is a beloved Christian hymn called "Bind Us Together":

Bind us together, Lord,
Bind us together 
With cords that cannot be broken.
Bind us together, Lord,
Bind us together,
Bind us together with love.

http://www.preciouslordtakemyhand.com/christianhymns/bindustogether.html

Hi,
In principle, your phrase is of Biblical origin in that it is a
variation of one that occurs in the statements of the significance of
the Jewish circumcision rite and Christian baptism:  "a bond that can
never be broken."

http://www.bris-milah.com/

http://216.239.59.104/search?q=cache:AJpdfh6qOkEJ:www.bereantruth.com/welch/Baptism.PDF+%22bond+that+can+never+be+broken%22+bible&hl=de&client=firefox-a

In the last link, at the very end.

In both religions, the relative rite signifies the infant's becoming a
member of the faith, irrevocably.

Maybe another arrangement of the words can be traced to an English
translation of the Bible.

Of course, the phrase is also appropriate to the marriage ceremony and
to any commitment of eternal love.

>>>Maybe another arrangement of the words can be traced to an English
translation of the Bible.<<<

I have 31 different English translations of the Holy Bible at my
disposal and I can assure you that it is NOT in the Bible.

tutuzdazd-ga

I agree with tutuzdad. This phrase is not in any translation of the
Bible that I'm aware of.

There are some places in the Bible that can be CONSTRUED to have a
similar meaning to the statement you offered. In the Book of Ephesians
for example the Apostle Paul speaks of the bond between God and man
that was created when God gave his son, Jesus Christ to be sacrificed
for mans' sins:

"Eph 2:13  But now in Christ Jesus ye who sometimes were far off are
made nigh by the blood of Christ.
Eph 2:14  For he is our peace, who hath made both one, and hath broken
down the middle wall of partition between us;
Eph 2:15  Having abolished in his flesh the enmity, even the law of
commandments contained in ordinances; for to make in himself of twain
one new man, so making peace;
Eph 2:16  And that he might reconcile both unto God in one body by the
cross, having slain the enmity thereby:
Eph 2:17  And came and preached peace to you which were afar off, and
to them that were nigh.
Eph 2:18  For through him we both have access by one Spirit unto the Father."

It may be somewhat of a stretch in the eyes of some religions (there
is debate about whether a bond with God can be broken or not, once it
has been established) but I could seen how the general message COULD
be said to be roughly the same thing you offered in your statement.

tutuzdad-ga

You both are right, of course, that the phrase cannot found in the
bible, but it is used as though it were, and in the site about Jewish
circumcision it is clearly used as a paraphrase of God's promised
covenant to Abraham (Genesis 17):

"2 And I will make my covenant between me and thee, and will multiply
thee exceedingly.
3 And Abram fell on his face: and God talked with him, saying,
4 As for me, behold, my covenant is with thee, and thou shalt be a
father of many nations.
5 Neither shall thy name any more be called Abram, but thy name shall
be Abraham; for a father of many nations have I made thee.
6 And I will make thee exceeding fruitful, and I will make nations of
thee, and kings shall come out of thee.
7 And I will establish my covenant between me and thee and thy seed
after thee in their generations for an everlasting covenant, to be a
God unto thee, and to thy seed after thee.
8 And I will give unto thee, and to thy seed after thee, the land
wherein thou art a stranger, all the land of Canaan, for an
everlasting possession; and I will be their God.
9 And God said unto Abraham, Thou shalt keep my covenant therefore,
thou, and thy seed after thee in their generations.
10 This is my covenant, which ye shall keep, between me and you and
thy seed after thee; Every man child among you shall be circumcised.
11 And ye shall circumcise the flesh of your foreskin; and it shall be
a token of the covenant betwixt me and you.
12 And he that is eight days old shall be circumcised among you, every
man child in your generations, he that is born in the house, or bought
with money of any stranger, which is not of thy seed.
13 He that is born in thy house, and he that is bought with thy money,
must needs be circumcised: and my covenant shall be in your flesh for
an everlasting covenant."

I know, a covenant is "a conditional promise" (my Webster's, Pinky :) 
), and, of course, only God can make an eternal "everlasting
covenant", Abraham and his descendents had/have to fulfil the
condition to maintain the covenant, thereby establishing the bond.

Can the first occurance of "bond that can never be broken" be found?