Reason and sources of hikmah from ibadah

Salah 

Surah Al-Ankabut 29:45 

 اُتْلُ مَآ اُوْحِيَ اِلَيْكَ مِنَ الْكِتٰبِ وَاَقِمِ الصَّلٰوةَۗ اِنَّ الصَّلٰوةَ تَنْهٰى عَنِ الْفَحْشَاۤءِ وَالْمُنْكَرِ ۗوَلَذِكْرُ اللّٰهِ اَكْبَرُ ۗوَاللّٰهُ يَعْلَمُ مَا تَصْنَعُوْنَ

  Recite that which has been revealed to you of the Book and keep up prayer; surely prayer keeps (one) away from indecency and evil, and certainly the remembrance of Allah is the greatest, and Allah knows what you do.

Sawm 

Surah Al-Baqarah 2:183

يٰٓاَيُّهَا الَّذِيْنَ اٰمَنُوْا كُتِبَ عَلَيْكُمُ الصِّيَامُ كَمَا كُتِبَ عَلَى الَّذِيْنَ مِنْ قَبْلِكُمْ لَعَلَّكُمْ تَتَّقُوْنَۙ

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

Surah Al-Tawbah 9:103

خُذۡ مِنۡ اَمۡوَالِهِمۡ صَدَقَةً تُطَهِّرُهُمۡ وَتُزَكِّيۡهِمۡ بِهَا وَصَلِّ عَلَيۡهِمۡ​ؕ اِنَّ صَلٰوتَكَ سَكَنٌ لَّهُمۡ​ؕ وَاللّٰهُ سَمِيۡعٌ عَلِيۡمٌ

(O Prophet)! "Take alms out of their riches and thereby cleanse them and bring about their growth (in righteousness), and pray for them. Indeed your prayer is a source of tranquility for them." Allah is All-Hearing, All-Knowing.

Hajj

Surah Al-Baqarah 2:197

اَلۡحَجُّ اَشۡهُرٌ مَّعۡلُوۡمٰتٌ ​ۚ فَمَنۡ فَرَضَ فِيۡهِنَّ الۡحَجَّ فَلَارَفَثَ 

وَلَا فُسُوۡقَۙ وَلَا جِدَالَ فِى الۡحَجِّ ؕ وَمَا تَفۡعَلُوۡا مِنۡ خَيۡرٍ 

يَّعۡلَمۡهُ اللّٰهُ ​ؕ وَتَزَوَّدُوۡا فَاِنَّ خَيۡرَ الزَّادِ التَّقۡوٰى وَاتَّقُوۡنِ 

يٰٓاُولِى الۡاَلۡبَاب

The Hajj is (to be performed in) the months that are well-known. So whoever undertakes Hajj in them, there should be no obscenity, no sin, no quarrel in the Hajj. Whatever good you do, Allah will know it. Take provisions along, for the merit of (having) provision is to abstain (from begging), and fear Me, O men of understanding!