'Holy Covenant' in the Bible

Then shall he go home again into his own land with great good, and set his heart against the holy covenant. He shall be busy against it, and then return home.

And why? The ships of Chittim shall come upon him, that he may be smitten and turn again: that he may take indignation against the covenant of holiness, to meddle against it. Yea he shall turn him, and draw such unto him, as leave the holy covenant.

To fulfill the mercy promised to our fathers; And to remember his holy covenant;