call not thy friends - Jesus certainly did not mean us to dispense with the duties of ordinary fellowship, but, remitting these to their proper place, inculcates what is better [Bengel].
lest ... a recompense be given thee - a fear the world is not afflicted with [Bengel]. The meaning, however, is that no exercise of principle is involved in it, as selfishness itself will suffice to prompt to it (Mat 5:46, Mat 5:47).