Mark 11:21 - Verse of the Day

Mark 11:28  And say unto him, By what authority doest thou these things? and who gave thee this authority to do these things?
Mark 11:33  And they answered and said unto Jesus, We cannot tell. And Jesus answering saith unto them, Neither do I tell you by what authority I do these things. Matthew 28:18  And Jesus came and spake unto them, saying, All power is given unto me in heaven and in earth.

G1849 (Strong) ἐξουσία exousia ex-oo-see'-ah

From G1832 (in the sense of ability); privilege, that is, (subjectively) force, capacity, competency, freedom, or (objectively) mastery (concretely magistrate, superhuman, potentate, token of control), delegated influence: - authority, jurisdiction, liberty, power, right, strength.

Total KJV occurrences: 103

It’s likely all of the preceding events contibuted to them asking about his authority.
Perhaps even these which seem more privately applied to his disciples.

The Lesson from the Withered Fig Tree

Mar 11:20 And in the morning, as they passed by, they saw the fig tree dried up from the roots.

Mar 11:21 And Peter calling to remembrance saith unto him, Master, behold, the fig tree which thou cursedst is withered away.

Mar 11:22 And Jesus answering saith unto them, Have faith in God.
Mar 11:23 For verily I say unto you, That whosoever shall say unto this mountain, Be thou removed, and be thou cast into the sea; and shall not doubt in his heart, but shall believe that those things which he saith shall come to pass; he shall have whatsoever he saith.
Mar 11:24 Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.
Mar 11:25 And when ye stand praying, forgive, if ye have ought against any: that your Father also which is in heaven may forgive you your trespasses.
Mar 11:26 But if ye do not forgive, neither will your Father which is in heaven forgive your trespasses.