The Passover was one of the appointed festivals (“anniversaries, ” The Bible in Living English) that the Hebrews were to celebrate each year. ​ — 2 Chron.
وَكَانَ يَجِبُ أَنْ يَتْبَعَ هٰذَا ٱلِٱحْتِفَالَ ٱلَّذِي يُقَامُ فِي ٱلـ‍ ١٤ مِنَ ٱلشَّهْرِ عِيدٌ لِسَبْعَةِ أَيَّامٍ .‏