1 I saw, and behold, the Lamb standing on Mount Zion, and with him one hundred forty-four thousand, having his name, and the name of his Father, written on their foreheads.
the Lamb standing on Mount Zion – Mount Zion represents the Sanctified Church, the Mountain that was first described in Isa 2:2. The Lamb “on Mount Zion” speaks of the washing of the Church by the blood of the Lamb. This is the Holy and Sanctified Church of the end days.
His name on their foreheads – this is the name of Jesus, the name of the body of Christ, the name of the temple of God, the sanctified Church, as described in Rev 3:12, see additional commentary there.