The word translated as "receive/accept" is a rare word meaning "make room for" and "makes way." Jesus only used it four times. It is the root of our word that means "arranging a dance," which is one way of describing a marriage.  In the next verse, in Matthew 15:17, where it refers to food in the belly, and John 8:37.

These two clauses in this verse do not seem to go together. Jesus often uses the conjunction between them to connect a negative clause, not doing something, with a positive one, instead of do this. Linguistically, the problem here is that the second active verb is missing, replaced with a participle. The problem is that we don't have an active verb we can assume here, so the verb may have been part of a question that was not recorded.