The 144,000

According to The New Testament, the only individuals recognized to be on “Mount Zion” at the time of MESSIAH’s advent are “The 144,000.”

Rev 14:1
1 Then I looked, and there before me was the Lamb, standing on Mount Zion, and with him 144,000 who had his name and his Father’s name written on their foreheads.
(NIV)