Proverbs 2:17

She is unfaithful to her own husband and forgets her sacred vows to God.

Jeremiah 3:4

Now you call to me. You say, 'Father!' You have been my friend ever since I was young.

Proverbs 5:18

Let your fountain be blessed. Rejoice with the wife of your youth.

Ezekiel 16:8

Then I passed by you and saw that you were at the time for love. So I spread my skirt over you and covered your nakedness. I also swore to you and entered into a covenant with you so that you became mine, declares the Lord Jehovah.

Ezekiel 16:59-60

The Lord Jehovah says: 'I will treat you the way you deserve, because you ignored your promises and broke the covenant.

Malachi 2:14-16

You ask: Why do you not accept our offerings? It is because Jehovah is a witness between you and the wife of your youth. The one to whom you have been unfaithful! She is your companion, the wife of your marriage vows.

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 fountain be blessed. Rejoice with the wife of your youth.
Jeremiah 3:4
Now you call to me. You say, 'Father!' You have been my friend ever since I was young.

Forgetteth

Ezekiel 16:8
Then I passed by you and saw that you were at the time for love. So I spread my skirt over you and covered your nakedness. I also swore to you and entered into a covenant with you so that you became mine, declares the Lord Jehovah.
Malachi 2:14
You ask: Why do you not accept our offerings? It is because Jehovah is a witness between you and the wife of your youth. The one to whom you have been unfaithful! She is your companion, the wife of your marriage vows.

General references

Exodus 20:14
Do not commit adultery.
Leviticus 15:20
Everything she lies on or sits on during her period will be unclean.
Numbers 5:12
Speak to the Israelites and say: 'A man's wife may have been unfaithful to him