Mark 2:15
And it came to pass, that, as Jesus sat at meat in his house, many publicans and sinners sat also together with Jesus and his disciples: for there were many, and they followed him.
Cross-reference
Matthew 9:10 is the parallel account—Jesus dining with tax collectors and sinners at the house.
In Matthew 9:11, Pharisees ask the same question about eating with sinners—parallel to this scene.
Luke 5:29 describes Levi's great banquet with many tax collectors—the Lukan parallel of this feast.
In Luke 5:30, Pharisees complain about Jesus eating with tax collectors and sinners—the same objection.
Matthew 21:31 declares tax collectors enter the kingdom first—reinforcing Jesus' acceptance of the outcasts he dines with here.
Matthew 21:32 notes tax collectors believed John—contrasting with Pharisees who rejected him, continuing the theme.
Luke 15:1 shows tax collectors and sinners drawing near to Jesus, continuing his association with them.