Parallel
Matthew 5:34
Patriarchal Greek New Testament (1904) · Berean Standard Bible
Ἐγὼ δὲ λέγω ὑμῖν μὴ ὀμόσαι ὅλως· μήτε ἐν τῷ οὐρανῷ, ὅτι θρόνος ἐστὶ τοῦ Θεοῦ·
But I tell you not to swear at all: either by heaven, for it is God’s throne;