Revelation 21:3--"from the throne" or "from heaven"?

Greek: καὶ ἤκουσα φωνῆς μεγάλης ἐκ τοῦ θρόνου λεγούσης Ἰδοὺ ἡ σκηνὴ τοῦ θεοῦ μετὰ τῶν ἀνθρώπων, καὶ σκηνώσει μετ' αὐτῶν, καὶ αὐτοὶ λαοὶ αὐτοῦ ἔσονται, καὶ αὐτὸς ὁ θεὸς μετ' αὐτῶν ἔσται

Alexandrian and Vulgate have the variant ἐκ τοῦ θρόνου, but Andreas reads οὐρανοῦ. Compare Scrivener's NT (1894).

Aune writes:

Variants: (1) θρόνου] A (lacuna in C) 94 vg IrenaeusLat Ambrose Tyc3. (2) οὐρανοῦ] 025 046 051 Oecumenius2053 Andreas Byzantine itgig syrph Tyc2 Beatus. The context (21:5) favors reading (1), while the origin of (2) can be explained as a mechanical repetition of the phrase ἐκ τοῦ οὐρανοῦ in 21:2 (see Schmid, Studien 2: 83; TCGNT 1, 763; TCGNT 2, 688).

Aune, Dr. David. Revelation 17-22, Volume 52C (Word Biblical Commentary) (p. 1242). Zondervan. Kindle Edition.

On the voice coming from the throne, see Rev. 4:5; 16:17; 19:5. Edmondo F. Lupieri also perceives a connection between ἡ σκηνὴ τοῦ θεοῦ and the tabernacle in Exodus (compare Leviticus 26:12; Rev. 7:15; 13:6; 15:5). See Lupieri, A Commentary on the Apocalypse of John, pages 333-334.