The Overthrowing - 81:20 He is powerful; he is authorized by the Owner of Authority.
In the context of verses 19, 20...23; Gabriel/Spiritual Jerusalem, the being from God who conveys divine knowledge:
The Overthrowing/81:19 This is the word of an honorable messenger.
The Overthrowing/81:20 He is powerful; he is authorized by the Owner of Authority.

The Bee/16:102 "Say, "The Holy Spirit has sent it down from your Lord with the truth, that it may strengthen those who believe and be a guidance and good news for the Muslims."

The Poets/26:192 This is the revelation sent down by the Lord of the universes.
The Poets/26:193 The Trustworthy Spirit (Gabriel) has sent it down.
The Poets/26:194 Into your heart... That you may be one of the warners.

The Ways of Ascent/70:4 To Him ascend the angels and the spirit (revelation/commands/Command/Jebrail) in a day equal to fifty thousand years.

The News/78:38 The Day will come when the Spirit and the angels will stand in rows. No one can speak except those whom the Most Merciful permits. And they will speak the truth.

The Majesty/97:3 The Night of Power is better than a thousand months.
The Majesty/97:4 On that night the angels and the Spirit (Gabriel) descend by the permission of their Lord to fulfill all the commands.

The Cow/2:87 We gave Moses the Book and sent messengers after him in succession. And We gave clear proofs to Jesus, son of Mary, and We supported him with the Holy Spirit. Whenever a messenger came to you with something you did not like, were you not arrogant? Indeed, some of them you denied and some of them you killed.
The Cow/2:97 "Say: "Whoever is an enemy to Jibril who has sent it down into your heart by Allah´s permission as a confirmation of what was before him and a guidance and glad tidings for those who believe,"
The Cow/2:253 And We favored some of those messengers more than others, for example, with some Allah spoke, and with some He raised them in degrees. We gave clear proofs to Jesus son of Mary and supported him with the Holy Spirit. Had Allah willed, those who came after them would not have quarrelled with one another after clear proofs had come to them. But they differed. Some believed and some disbelieved. Had Allah willed, they would not have fought one another. But Allah does what He wills.

The Table Spread/5:110 "Allah will say: O Jesus son of Mary, remember My favor which I bestowed on you and your mother. I supported you with the Holy Spirit so that you could speak to the people when you were in the cradle and when you were grown up. I taught you the Book, wisdom, the Torah and the Gospel, and by My permission you made a bird out of clay, and when I breathed into it, it became a bird by My permission. By my permission you healed the blind and the leper. You raised the dead by my permission. And although you brought clear proofs to the Children of Israel, the disbelievers among them said, "This is nothing but a clear sorcery,"and I saved you from them."

The Night Journey/17:85 "They ask you about the spirit (revelation). Say: "Revelation comes from my Lord. The knowledge given to you is very little."

Council/42:52 So We revealed to you a spirit from Our Presence, and you did not know what a book was and what faith was. But We have made it a light that guides the servants whom We will to the truth. Surely you are a guide to the right path.