Mark 7:15 is the original saying that nothing outside defiles — here Jesus explains it to his disciples, clarifying the meaning.

Mark 7:23 lists the evil things from within that defile — completing and reinforcing Jesus' point about inner purity.

In Mark 4:13, Jesus asks 'Do you not understand this parable?' — the exact same rhetorical rebuke as here.

Mark 6:52 says disciples' hearts were hardened so they didn't understand the loaves — the same dullness Jesus rebukes here.

Matthew 15:16 records the identical rebuke 'Are you also still without understanding?' — a direct parallel.

Matthew 15:17 continues Jesus' explanation that food passes through the body — the same teaching on what defiles.

Leviticus 11:8 commands not to touch unclean carcasses — the very dietary law Jesus overturns here by declaring nothing outside defiles.

Colossians 2:22 condemns human precepts about food — echoing Jesus' rejection of dietary purity laws in this passage.

In Matthew 16:11, Jesus similarly rebukes disciples for misunderstanding his teaching about bread, linking their dullness to failing to grasp spiritual truth.

Luke 24:25 shows Jesus rebuking disciples as 'slow of heart' to believe, echoing the same frustration with lack of understanding seen here.

Hebrews 5:11 mentions 'dull of hearing,' directly paralleling Jesus' rebuke of the disciples' lack of understanding in this verse.