ὅστις γὰρ ἂν ποιήσῃ κ.τ.λ. ‘These which hear the word of God and do it’ (Luke 8:21).

τοῦ ἐν οὐρανοῖς. The addition is important. ‘Not those who do the will of my earthly father, but those who do the will of my heavenly Father are brethren.’ The essence of sonship is obedience, and obedience to God constitutes brotherhood to Jesus who came to do τὸ θέλημα τοῦ πέμψαντος. John 6:38.

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Old Testament