Qur'an 2:183

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوا۟ كُتِبَ عَلَيْكُمُ ٱلصِّيَامُ كَمَا كُتِبَ عَلَى ٱلَّذِينَ مِن قَبْلِكُمْ لَعَلَّكُمْ تَتَّقُونَ

“O you who have believed, decreed upon you is fasting as it was decreed upon those before you that you may become righteous -”

Al-Baqara 2:183 · Saheeh International