John 16:20

ἀμὴν … ὅτι κλαύσετε καὶ θρηνήσετε ὑμεῖς, “ye shall weep and lament”; θρηνέω is commonly used of lamentation for the dead, as in Jeremiah 21:10, μὴ κλαίετε τὸν τεθνηκότα, μηδὲ θρηνεῖτε αὐτόν; 2 Samuel 1:17; Matthew 11:17; Luke 7:32. Here it is weeping and lamentation for the dead that is meant. ὁ δὲ κόσμος χαρήσεται, but while you mourn, the world shall rejoice, as achieving a triumph over a threatening enemy. ὑμεῖς δὲ λυπηθήσεσθε, “and ye shall be sorrow-stricken, but your sorrow shall become joy”. Cf. ἀπὸ πένθους εἰς χαράν, Esther 9:22, and especially John 20:20, ἐχάρησαν οἱ μαθηταὶ ἰδόντες τὸν Κύριον.