Luke 20:5 KJV

And they reasoned with themselves, saying, If we shall say, From heaven; he will say, Why then believed ye him not?
Luke 20:5, King James Version

In context

4 The baptism of John, was it from heaven, or of men?

5 And they reasoned with themselves, saying, If we shall say, From heaven; he will say, Why then believed ye him not?

6 But and if we say, Of men; all the people will stone us: for they be persuaded that John was a prophet.