John Gill Commentary Mark 10:3

"And he answered and said unto them, What did Moses command you?" — Mark 10:3 (ASV)

And he answered and said to them
Very prudently and wisely,

what did Moses command you ?
According to Matthew, he put another question to them; see (Matthew 19:4); no doubt but both were put, and this after they had urged the authority and law of Moses.

And therefore he very pertinently asks them what Moses had said about divorces, what law he had left, and puts them upon producing and repeating it, that the sense of it might be examined and considered, upon what account it was given.