Proverbs 2:17

who forsakes the prince of her youth and forgets the covenant of her God.

Jeremiah 3:4

Wilt thou not from this time cry unto me, My father, thou art the guide of my youth?

Proverbs 5:18

Thy fountain shall be blessed; and rejoice with the wife of thy youth.

Ezekiel 16:8

And I passed by thee and looked upon thee; behold, thy time was the time of love; and I spread my mantle over thee and covered thy shame; and I gave thee an oath and entered into a covenant with thee, said the Lord GOD, and thou becamest mine;

Ezekiel 16:59-60

For thus hath the Lord GOD said: Will I deal with thee even as thou hast done, despising the oath to invalidate the covenant?

Malachi 2:14-16

Yet ye say, Why? Because the LORD has been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously; yet she is thy companion and the wife of thy covenant.

Treasury of Scripture Knowledge

Summary

Which forsaketh the guide of her youth, and forgetteth the covenant of her God.

Bible References

The guide

Proverbs 5:18
Thy fountain shall be blessed; and rejoice with the wife of thy youth.
Jeremiah 3:4
Wilt thou not from this time cry unto me, My father, thou art the guide of my youth?

Forgetteth

Ezekiel 16:8
And I passed by thee and looked upon thee; behold, thy time was the time of love; and I spread my mantle over thee and covered thy shame; and I gave thee an oath and entered into a covenant with thee, said the Lord GOD, and thou becamest mine;
Malachi 2:14
Yet ye say, Why? Because the LORD has been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously; yet she is thy companion and the wife of thy covenant.

General references

Exodus 20:14
Thou shalt not commit adultery.
Leviticus 15:20
And everything that she lies upon in her separation shall be unclean; everything also that she sits upon shall be unclean.
Numbers 5:12
Speak unto the sons of Israel and say unto them, If any man's wife goes astray and betrays him,