'Covenant' in the Bible

For the unbelieving husband is sanctified [that is, he receives the blessings granted] through his [Christian] wife, and the unbelieving wife is sanctified through her believing husband. Otherwise your children would be [ceremonially] unclean, but as it is they are holy.

And all [of them] were baptized into Moses [into his safekeeping as their leader] in the cloud and in the sea;

In the same way, after supper He took the cup, saying, “This cup is the new covenant [ratified and established] in My blood; do this, as often as you drink it, in [affectionate] remembrance of Me.”