Luke 11:28 directly repeats the same principle: hearing and obeying God's word defines true blessedness.

James 1:22 explicitly warns against merely listening and urges doing the word — identical theme.

Matthew 7:21-26 expands on hearing and doing, using the house builders to contrast obedience with mere profession.

In Hebrews 2:11-13, Jesus is not ashamed to call believers brothers, directly citing the spiritual brotherhood that Luke 8:21 redefines.

In Matthew 25:40, Jesus calls the needy 'my brothers,' reinforcing his redefinition of family as those who serve him through obedience.

In Matthew 25:45, the opposite neglect of Jesus' brothers carries the same identification, echoing the family redefinition in Luke 8:21.

In Matthew 28:10, Jesus calls his disciples 'brothers,' directly applying the spiritual family concept from Luke 8:21 to his followers.

John 13:17 promises blessing for doing what you know — a direct echo of hearing and putting into practice.

In John 15:14, Jesus makes friendship conditional on obedience, paralleling Luke 8:21's link between doing God's word and being family.

In John 15:15, Jesus elevates disciples from servants to friends, deepening the relational redefinition already seen in Luke 8:21.

In John 20:17, Jesus calls believers 'my brothers,' directly affirming the spiritual kinship taught in Luke 8:21.

In 2 Corinthians 6:18, God promises to be a father to believers, expanding the spiritual family concept from Luke 8:21 to divine adoption.

In 2 Corinthians 5:16, Paul says we no longer regard Christ according to the flesh, aligning with Luke 8:21's shift from biological to spiritual family.

Ezekiel 33:31 describes those who hear God's words but do not practice them — the opposite of Jesus' true family.

Philippians 4:9 urges putting into practice what was heard, directly aligning with Jesus' definition of his family.

Romans 2:13 echoes that hearing alone is insufficient — only doers are righteous before God.

In Matthew 12:50, Jesus gives the same teaching: doing God's will defines family, echoing this verse.

In Genesis 7:5, Noah exemplifies hearing God's word and acting on it — the exact obedience Jesus calls for.

1 John 3:23 specifies the command as believing in Jesus and loving — concrete examples of doing God's word.

John 6:29 defines the work of God as believing in Jesus — connecting the doing of Luke 8:21 to faith.

1 John 2:29 ties doing what is right to being born of God — expanding the doing aspect to identity.

1 John 3:22 links keeping commands (doing) with answered prayer — amplifying the obedience theme.

3 John 1:11 urges doing good as evidence of being from God — aligns with the doing emphasis in Luke 8:21.

1 Thessalonians 2:13 describes the word at work in believers who accept it, complementing Jesus' call to hear and practice.