John Gill Commentary Numbers 12:13

"And Moses cried unto Jehovah, saying, Heal her, O God, I beseech thee." — Numbers 12:13 (ASV)

And Moses cried to the Lord
With a loud voice, and with great earnestness and importunity, being heartily affected with the miserable condition Miriam was in:

saying, heal her now, O God, I beseech you ;
in the original text it is, "O God now, heal her now"; for the same particle is used at the close as at the beginning of the petition; and the repetition of it shows his earnestness and importunity that she might be healed directly, immediately, without any delay; and Moses uses the word "El", which signifies the strong and mighty God, as expressive of his faith in the power of God, that he was able to heal her; and at the same time suggests that none but he could do it; and so Aben Ezra interprets it,

``you who have power in your hand, now heal her;'' this prayer is a proof of his being of a meek, humble, and forgiving spirit.