Genesis 2:20-24 New American Standard Bible (NASB)

²⁰ The man gave names to all the cattle, and to the birds of the ^[a]sky, and to every beast of the field, but for ^[b]Adam there was not found a helper ^[c]suitable for him. ²¹ So the Lord God caused a deep sleep to fall upon the man, and he slept; then He took one of his ribs and closed up the flesh at that place. ²² The Lord God ^[d]fashioned into a woman the rib which He had taken from the man, and brought her to the man. ²³ The man said,

²⁴ For this reason a man shall leave his father and his mother, and be joined to his wife; and they shall become one flesh.

Mark 10:6-9 New American Standard Bible (NASB)

⁶ But from the beginning of creation, God made them male and female. ⁷ For this reason a man shall leave his father and mother^[a], ⁸ and the two shall become one flesh; so they are no longer two, but one flesh. ⁹ What therefore God has joined together, let no man separate.”