“These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots;”
King James Version (KJV)
1:12 These are spots - Blemishes. In your feasts of love - Anciently observed in all the churches. Feeding themselves without fear - Without any fear of God, or jealousy over themselves. Twice dead - In sin, first by nature, and afterwards by apostasy. Plucked up by the roots - And so incapable of ever reviving.
Jude 1:12 These are spots in your feasts of charity when they feast with you. See notes on "2Pe 2:13". They engaged in revelings at the "Agape", the love feasts. Clouds without water. Rainless clouds. See PNT "2Pe 2:17". Trees, without fruit. Fruitless, barren. Twice dead. Doubly dead, hence, no hope of fruit.