民數記 12:2 註釋：Rashi, Rashbam, Sforno & Or HaChaim

הרק אך FOR HAS INDEED THE LORD SPOKEN with him alone.

'ויאמרו הרק אך במשה וגו, in addition to what they had already said concerning the Cushite woman to whom Moses was married, they also had another subject to criticise him for, namely that Moses could not boast about G’d communicating with him, seeing G’d did also speak to them.

'הרק אך במשה דבר ה?, has Moses been the only one who experienced the distinction that G’d spoke to him in addition to the whole people experiencing that G’d spoke to them when He gave the Ten Commandments?

הלא גם בנו HAS HE NOT ALSO [SPOKEN] WITH US, and we have not separated from our spouses! (Sifrei Bamidbar 100).