Mark 10:10

And in the house
To which Christ retired, after he had put the Pharisees to silence, and dismissed the multitude:

his disciples asked him again of the same matter;
concerning the affair of divorces, he had been discoursing with the Pharisees about; some things being said, they had not been used to, and which they did not thoroughly understand; and therefore chose privately to converse with him on this subject, for their further information.