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Takhrij Hadith 1499: "Moses and Aaron supplicated against…"
It was narrated from the Prophet (peace and blessings be upon him) that he said:
“
Moses and Aaron supplicated against Pharaoh and his people, as our Lord mentioned (Our Lord, obliterate their wealth and harden their hearts), and some people said: Their supplication was delayed for forty years, because Pharaoh was dutiful to his mother”