يَٰٓأَيُّهَا 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
Surah Baqarah Ayat 183

In another narration, the Prophet ^PBUH said:
اللَّهُمَّ أَهِلَّهُ عَلَيْنَا بِالْأَمْنِ وَالْإِيمَانِ وَالسَّلَامَةِ وَالْإِسْلَامِ وَالتَّوْفِيقِ لِمَا تُحِبُّ وَتَرْضَى رَبُّنَا وَرَبُّكَ اللَّهُ
O Allah, bring it over us with safety and faith, security and Islam, guidance to what You love and is pleasing to You. Our Lord and your Lord is Allah.
Source: Ṣaḥīḥ Ibn Ḥibbān 888

Hazrath Imam Mahdi ^PBUH is narrated to have said that-” the commandments I explain are those that I explain ( from the information I recieve from Allah and) by the command of Allah, and whoever rejects even one letter of these commandments , will be callad to account before Allah (and punished).”

Hazrath Ali Ul Murtuza ^Rz. said that -“When a man begs, he loses his faith.”