Proverbs 2:17

who forsakes the friend of her youth, and forgets the covenant of her God:

Jeremiah 3:4

Will you not from this time cry to me, 'My Father, you are the guide of my youth?'

Proverbs 5:18

Let your spring be blessed. Rejoice in the wife of your youth.

Ezekiel 16:8

Now when I passed by you, and looked at you, behold, your time was the time of love; and I spread my skirt over you, and covered your nakedness: yes, I swore to you, and entered into a covenant with you, says the Lord Yahweh, and you became mine.

Ezekiel 16:59-60

For thus says the Lord Yahweh: I will also deal with you as you have done, who have despised the oath in breaking the covenant.

Malachi 2:14-16

Yet you say, 'Why?' Because Yahweh has been witness between you and the wife of your youth, against whom you have dealt treacherously, though she is your companion, and the wife of your 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 your spring be blessed. Rejoice in the wife of your youth.
Jeremiah 3:4
Will you not from this time cry to me, 'My Father, you are the guide of my youth?'

Forgetteth

Ezekiel 16:8
Now when I passed by you, and looked at you, behold, your time was the time of love; and I spread my skirt over you, and covered your nakedness: yes, I swore to you, and entered into a covenant with you, says the Lord Yahweh, and you became mine.
Malachi 2:14
Yet you say, 'Why?' Because Yahweh has been witness between you and the wife of your youth, against whom you have dealt treacherously, though she is your companion, and the wife of your covenant.

General references

Exodus 20:14
"You shall not commit adultery.
Leviticus 15:20
"'Everything that she lies on in her impurity shall be unclean. Everything also that she sits on shall be unclean.
Numbers 5:12
"Speak to the children of Israel, and tell them: 'If any man's wife goes astray, and is unfaithful to him,