And another angel came out of the temple, crying with a loud voice to Him who sat on the cloud, “Thrust in Your sickle and reap, for the time has come for You to reap, for the harvest of the earth is ripe.” Revelation 14:15

There was first a harvest, and then a vintage. The harvest is the righteous; the vintage is the wicked. When the wicked are gathered, an angel gathers them; but Christ will not trust an angel to reap the righteous. “He that sat on the cloud thrust in His sickle. “O my soul, when thou comest to die, Christ will Himself come after thee; when thou art to be cut down He that sits upon the throne will cut thee down with a very sharp sickle, in order that He may do it as easily as possible. He will be the Reaper Himself; no reaper will be allowed to gather Christ’s saints in, but Christ the King of saints. Oh, will it not be a joyful harvest when all the chosen race, every one of them, shall be gathered in? There is a little shrivelled grain of wheat, there, that has been growing somewhere on the headland, and that will be there. There are a great many who have been hanging down their heads, heavy with grain, and they will be there too. They will all be gathered in.

“His honor is engaged to save
The meanest of His sheep;
All that His heavenly Father gave
His hands securely keep.”

~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/2896.cfm