Revelation 3:20 (BSB)

Behold, I stand at the door and knock. If anyone hears My voice and opens the door, I will come in and dine with him, and he with Me.

From Revelation 3. Also in the ESV.

Commentary on Revelation 3:20

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Revelation 3:14-22: We now come to the last and worst of all the seven Asian churches, the reverse of the church of Philadelphia; for, as there was nothing reproved in that, here is nothing commended in this, and yet this was one of the seven golden candlesticks, for a corrupt church may still be a church. Here we have, as before, I. The inscription, to whom, and from whom. 1.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Revelation 3:20: He that hath an ear, let him hear,.... See Gill on Rev 2:7. Next: Revelation Chapter 4
• Albert Barnes (Presbyterian), Barnes' New Testament Notes on Revelation 3:20: Verse 20. Behold, I stand at the door, and knock. Intimating that, though they had erred, the way of repentance and hope was not closed against them. He was still willing to be gracious, though their conduct had been such as to be loathsome, . To see the real force of this language, we must remember how disgusting and offensive their conduct had been to him.
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Revelation 3:20: stand--waiting in wonderful condescension and long-suffering. knock-- (Sol 5:2). This is a further manifestation of His loving desire for the sinner's salvation. He who is Himself "the Door," and who bids us "knock" that it may be "opened unto" us, is first Himself to knock at the door of our hearts. If He did not knock first, we should never come to knock at His door.