“The tombs also
Of the saints,
Who had fallen asleep.
καὶ τὰ μνημεῖα ἀνεῴχθησαν καὶ πολλὰ σώματα τῶν κεκοιμημένων ἁγίων ἠγέρθησαν·
This is unique to Matthew, since the other 3 gospels do not mention anything about tombs, bodies, or saints being raised. However, Matthew clearly said that the tombs were also opened (καὶ τὰ μνημεῖα ἀνεῴχθησαν), so that many bodies of the holy saints, who had fallen asleep (καὶ πολλὰ σώματα τῶν κεκοιμημένων ἁγίων), arose or were raised up (ἠγέρθησαν). It was the general Jewish expectation that at the end times, the Day of Yahweh, that the dead would rise, especially among the Pharisees. The holy ones or saints were the righteous ones who had died before Jesus.