Cross reference
1 Corinthians 7:6
6 and this I say by way of concurrence -- not of command,
2 Corinthians 8:8
8 not according to command do I speak, but because of the diligence of others, and of your love proving the genuineness,
1 Corinthians 7:12
12 And to the rest I speak -- not the Lord -- if any brother hath a wife unbelieving, and she is pleased to dwell with him, let him not send her away;
1 Corinthians 7:25
25 And concerning the virgins, a command of the Lord I have not; and I give judgment as having obtained kindness from the Lord to be faithful:
2 Corinthians 11:17
17 That which I speak, I speak not according to the Lord, but as in foolishness, in this the confidence of boasting;