Baptism of Suffering - Michael John Rood

1Cor.15:51 Behold, I tell you a mystery: We shall not all sleep, but we shall all be changed— 52 in a moment, in the twinkling of an eye, at the LAST trumpet. For the trumpet will sound, and the dead will be raised incorruptible, and we shall be changed.

Mat.24:29 Immediately AFTER the tribulation of those days the sun will be darkened, and the moon will not give its light; the stars will fall from heaven, and the powers of the heavens will be shaken. 30 THEN the sign of the Son of Man will appear in heaven, and then all the tribes of the earth will mourn, and they will see the Son of Man coming on the clouds of heaven with power and great glory. 31 And He will send His angels with a great sound of a TRUMPET and they will GATHER together His elect from the four winds, from one end of heaven to the other.

NKJV

Hebrew word for water cleansing or baptism is "Mikvah".