People say "the rapture is Tuesday" because a South African evangelical pastor, Joshua Mhlakela, predicted that the Rapture will start on September 23, 2025, which coincides with the Jewish holiday Rosh Hashanah (the Feast of Trumpets). This date has biblical connections to the "trumpet call of God" mentioned in Thessalonians and other New Testament scriptures about the end times. This prediction has gone viral, especially on TikTok under hashtags like #RaptureTok, where many devout Christians believe that on this day, believers will be taken up to heaven, and non-believers will be left behind to endure a period of tribulation. The viral trend has also included some people taking practical steps like selling possessions in anticipation of the event.
In summary, the idea that "the rapture is Tuesday" comes from a specific prophecy tied to a significant religious holiday and has gained widespread attention through social media, particularly among evangelical Christians.