“The Prophet ﷺ came to Al- Madinah, and he found the Jews observing a fast. He said: ‘What is this?’ They said: ‘This is the day when Allah saved Musa and drowned Pharaoh, so Musa fasted this day in gratitude.’ The Messenger of Allah ﷺ said: ‘We have more right to Musa than you do.’ So he fasted (that day) and enjoined (others) to fast it also.’”
قَدِمَ النَّبِيُّ ﷺ الْمَدِينَةَ فَوَجَدَ الْيَهُودَ صُيَّامًا فَقَالَ مَا هَذَا؟ قَالُوا هَذَا يَوْمٌ أَنْجَى اللَّهُ فِيهِ مُوسَى وَأَغْرَقَ فِيهِ فِرْعَوْنَ فَصَامَهُ مُوسَى شُكْرًا فَقَالَ رَسُولُ اللَّهِ ﷺ نَحْنُ أَحَقُّ بِمُوسَى مِنْكُمْ فَصَامَهُ وَأَمَرَ بِصِيَامِهِ