New Revised Standard Version
They argued with one another, “If we say, ‘From heaven,’ he will say, ‘Why then did you not believe him?’

Contemporary English Version
They thought it over and said to each other, "We can't say that God gave John this right. Jesus will ask us why we didn't believe John.

New American Bible
They discussed this among themselves and said, “If we say, ‘Of heavenly origin,’ he will say, ‘[Then] why did you not believe him?’

Douay-Rheims Bible
But they thought with themselves, saying: If we say, From heaven; he will say, Why then did you not believe him?

But they thought with themselves, saying: If we say, From heaven; he will say, Why then did you not believe him?

Why.

Matthew 11:7-14 And when they went their way, Jesus began to say to the multitudes concerning John: What went you out into the desert to see? a reed shaken with the wind? . . .

Matthew 21:25-27,31,32 The baptism of John, whence was it? From heaven or from men? But they thought within themselves, saying: . . .

John 1:15,29,34,36 John beareth witness of him and crieth out, saying: This was he of whom I spoke: He that shall come after me is preferred before me: because he was before me. . . .

John 3:29-36 He that hath the bride is the bridegroom: but the friend of the bridegroom, who standeth and heareth Him, rejoiceth with joy because of the bridegroom's voice. This my joy therefore is fulfilled. . . .