English Standard Version
Now as a concession, not a command, I say this.

American Standard Version
But this I say by way of concession, not of commandment.

Berean Study Bible
I say this as a concession, not as a command.

Douay-Rheims Bible
But I speak this by indulgence, not by commandment.

English Revised Version
But this I say by way of permission, not of commandment.

King James Bible
But I speak this by permission, and not of commandment.

World English Bible
But this I say by way of concession, not of commandment.

Young's Literal Translation
and this I say by way of concurrence -- not of command,

1 Corinthians 7:6 Additional Translations ...