Verses on Putting God First in our Lives:

 1 John 4:19
We love him, because he first loved us.


Matthew 22:37-40
37Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind.
38This is the first and great commandment.
39And the second is like unto it, Thou shalt love thy neighbour as thyself. 40On these two commandments hang all the law and the prophets.

Deuteronomy 11:13-16
13And it shall come to pass, if ye shall hearken diligently unto my commandments which I command you this day, to love the LORD your God, and to serve him with all your heart and with all your soul,
14That I will give you the rain of your land in his due season, the first rain and the latter rain, that thou mayest gather in thy corn, and thy wine, and thine oil.
15And I will send grass in thy fields for thy cattle, that thou mayest eat and be full.
16Take heed to yourselves, that your heart be not deceived, and ye turn aside, and serve other gods, and worship them;

Proverbs 29:25
25The fear of man bringeth a snare: but whoso putteth his trust in the LORD shall be safe.
 

We must always Put God First in our marriage.
It simply a step of obedience to Him.