Mark 11:29
And Jesus answered and said unto them, I will also ask of you one question, and answer me, and I will tell you by what authority I do these things.
Cross-references
Matthew 21:24
Parallel
Matthew 21:24 is the synoptic parallel, recording Jesus' identical reply to the chief priests and elders.
Luke 20:3–8
Parallel
Luke 20:3-8 is the parallel account, where Jesus poses the same question about John's baptism.