“Did the baptism
Come from heaven?
Or was it
Of human origin?
τὸ βάπτισμα τὸ Ἰωάνου ἐξ οὐρανοῦ ἦν ἢ ἐξ ἀνθρώπων; ἀποκρίθητέ μοι.
This question about John the Baptist and the value of his baptism can be found in Matthew, chapter 21:25, and Luke, chapter 20:4, almost word for word. Mark said that Jesus asked this one question. Did the baptism of John the Baptist (τὸ βάπτισμα τὸ Ἰωάνου) come from heaven (ἐξ οὐρανοῦ ἦν) or was it of human man-made origin, from men (ἢ ἐξ ἀνθρώπων)? He wanted an answer (ἀποκρίθητέ μοι). This also seems fair enough.