And the LORD God caused a deep sleep to fall upon Adam, and he slept: and he took one of his ribs, and closed up the flesh instead thereof; And the rib, which the LORD God had taken from man, made he a woman, and brought her unto the man. And Adam said, This is now bone of my bones, and flesh of my flesh: she shall be called Woman, because she was taken out of Man. Therefore shall a man leave his father and his mother, and shall cleave unto his wife: and they shall be one flesh.
The first marriage in the Bible is described rather than commanded: a man leaves the household he was born into, attaches himself to his wife, and the two are counted as one body. Jesus and Paul both quote verse 24 as the pattern.