John Gill Commentary Mark 11:30

"The baptism of John, was it from heaven, or from men? answer me." — Mark 11:30 (ASV)

The baptism of John
The doctrine of which he was the first preacher, and the ordinance of which he was the first administrator:

was it from heaven, or of men ?
was it of divine or of human institution?

answer me ;
directly and plainly, without any shuffling, or evasion: it is a fair question, and may be answered; and the answer to it our Lord suggests would naturally lead to a proper one to their question; (See Gill on Matthew 21:25).