Revelation 6:9

9AndΚαὶwhenὅτεHe openedἤνοιξενtheτὴνfifthπέμπτηνsealσφραγῖδα,I sawεἶδονunderὑποκάτωtheτοῦaltarθυσιαστηρίουtheτὰςsoulsψυχὰςof thoseτῶνhaving been slainἐσφαγμένωνbecause ofδιὰtheτὸνwordλόγοντοῦof Godθεοῦandκαὶbecause ofδιὰtheτὴνtestimonyμαρτυρίανwhichἣνthey had upheldεἶχον.

And when He opened the fifth seal, I saw under the altar the souls of those having been slain because of the word of God and because of the testimony that they had.