Proverbs 2:17

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

Jeremiah 3:4

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

Proverbs 5:18

Let thy fountain be blessed: and rejoice with the wife of thy youth.

Ezekiel 16:8

Now when I passed by thee, and looked upon thee, behold, thy time was the time of love; and I spread my skirt over thee, and covered thy nakedness: yes, I swore to thee, and entered into a covenant with thee, saith the Lord GOD, and thou becamest mine.

Ezekiel 16:59-60

For thus saith the Lord GOD; I will even deal with thee as thou hast done, who hast despised the oath in breaking the covenant.

Malachi 2:14-16

Yet ye say, Why? Because the LORD hath been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously: yet is she 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
Let thy fountain be blessed: and rejoice with the wife of thy youth.
Jeremiah 3:4
Wilt thou not from this time cry to me, My father, thou art the guide of my youth?

Forgetteth

Ezekiel 16:8
Now when I passed by thee, and looked upon thee, behold, thy time was the time of love; and I spread my skirt over thee, and covered thy nakedness: yes, I swore to thee, and entered into a covenant with thee, saith the Lord GOD, and thou becamest mine.
Malachi 2:14
Yet ye say, Why? Because the LORD hath been witness between thee and the wife of thy youth, against whom thou hast dealt treacherously: yet is she thy companion, and the wife of thy covenant.

General references

Exodus 20:14
Thou shalt not commit adultery.
Leviticus 15:20
And every thing that she lieth upon in her separation shall be unclean: every thing also that she sitteth upon shall be unclean.
Numbers 5:12
Speak to the children of Israel, and say to them, If any man's wife shall go astray, and commit a trespass against him,