KJV : I speak <3004> (5719) not <3756> by <2596> commandment <2003>, but <235> by occasion <1223> of the forwardness <4710> of others <2087>, and <2532> to prove <1381> (5723) the sincerity <1103> of your <5212> love <26>.

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NASB : I am not speaking \i1 this\i0 as a command, but as proving through the earnestness of others the sincerity of your love also.

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NASB# : I am not speaking<3004> <I>this</I> as a command<2003>, but as proving<1381> through<1223> the earnestness<4710> of others<2087> the sincerity<1103> of your love<26> also<2532>.