Here are 8 Bible verses about family planning from the Old and New Testaments of the Holy Bible (King James Version), sorted from most to least relevant.
Psalms 127:3 KJV
Lo, children are an heritage of the LORD: and the fruit of the womb is his reward.
1 Timothy 5:8 KJV
But if any provide not for his own, and specially for those of his own house, he hath denied the faith, and is worse than an infidel.
John 3:16-17 KJV
For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life. For God sent not his Son into the world to condemn the world; but that the world through him might be saved.
Ephesians 6:4 KJV
And, ye fathers, provoke not your children to wrath: but bring them up in the nurture and admonition of the Lord.
Galatians 5:19-21 KJV
Now the works of the flesh are manifest, which are these; Adultery, fornication, uncleanness, lasciviousness, Idolatry, witchcraft, hatred, variance, emulations, wrath, strife, seditions, heresies, Envyings, murders, drunkenness, revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
Genesis 38:9-10 KJV
And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother’s wife, that he spilled it on the ground, lest that he should give seed to his brother. And the thing which he did displeased the LORD: wherefore he slew him also.
Romans 1:25-26 KJV
Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen. For this cause God gave them up unto vile affections: for even their women did change the natural use into that which is against nature:
Deuteronomy 4:10 KJV
Specially the day that thou stoodest before the LORD thy God in Horeb, when the LORD said unto me, Gather me the people together, and I will make them hear my words, that they may learn to fear me all the days that they shall live upon the earth, and that they may teach their children.