Suuratus – Sajdah Verse 16.
تَتَجَافَىٰ جُنُوبُهُمْ عَنِ ٱلْمَضَاجِعِ يَدْعُونَ رَبَّهُمْ خَوْفًا وَطَمَعًا وَمِمَّا رَزَقْنَـٰهُمْ يُنفِقُونَ ﴿١٦
فَلَا تَعْلَمُ نَفْسٌ مَّآ أُخْفِىَ لَهُم مِّن قُرَّةِ أَعْيُنٍ جَزَآءًۢ بِمَا كَانُوا۟ يَعْمَلُونَ ﴿١٧
16. Their sides forsake their beds, to invoke their Lord in fear and hope, and they spend (charity in Allah’s Cause) out of what We have bestowed on them. 17. No person knows what is kept hidden for them of joy as a reward for what they used to do.
Tafsir Ibn Kathir Volume 7, Page 615.
Then Allah says:
﴿تَتَجَافَى جُنُوبُهُمْ عَنِ الْمَضَاجِعِ﴾
(Their sides forsake their beds,) meaning, they pray the voluntary night prayer and forego sleep and resting on a comfortable bed. Mujahid and Al-Hasan said that the Ayah
﴿تَتَجَافَى جُنُوبُهُمْ عَنِ الْمَضَاجِعِ﴾
(Their sides forsake their beds, ) refers to voluntary night prayer. Ad-Dahhak said, “It refers to Salat Al-`Isha’ in congregation and Salat Al-Fajr in congregation.
﴿يَدْعُونَ رَبَّهُمْ خَوْفاً وَطَمَعاً﴾
(to invoke their Lord in fear and hope,) means, in fear of His punishment and in hope of His reward.
﴿وَمِمَّا رَزَقْنَـهُمْ يُنفِقُونَ﴾
(and they spend out of what We have bestowed on them.) means, they do both obligatory and supererogatory acts of worship. Their leader in this world and the Hereafter is the Messenger of Allah . Imam Ahmad recorded that Mu`adh bin Jabal said, “I was with the Messenger of Allah on a journey one morning, walking near him. I said, `O Prophet of Allah, tell me of a deed that will grant me admittance to Paradise and keep me away from Hell.’ He said:
«لَقَدْ سَأَلْتَ عَنْ عَظِيمٍ وَإِنَّهَ لَيَسِيرٌ عَلَى مَنْ يَسَّرَهُ اللهُ عَلَيْهِ، تَعْبُدُ اللهَ وَلَا تُشْرِكُ بِهِ شَيْئًا، وَتُقِيمُ الصَّلَاةَ وَتُؤْتِي الزَّكَاةَ، وَتَصُومُ رَمَضَانَ، وَتَحُجُّ الْبَيْت»
(You have asked about something great, and it is easy for the one for whom Allah makes it easy. Worship Allah and do not associate anything with Him, establish regular prayer, pay Zakah, fast Ramadan and perform pilgrimage to the House.) Then he said:
«أَلَا أَدُلُّكَ عَلَى أَبْوَابِ الْخَيْرِ؟ الصَّومُ جُنَّةٌ، وَالصَّدَقَةُ تُطْفِىءُ الْخَطِيئَةَ، وَصَلَاةُ الرَّجُلِ فِي جَوْفِ اللَّيْل»
(Shall I not tell you of the gates of goodness Fasting is a shield, charity wipes out sin, and the prayer of a man in the depths of the night.)