حَدَّثَنَا آدَمُ، حَدَّثَنَا وَرْقَاءُ، عَنِ ابْنِ أَبِي نَجِيحٍ، عَنْ مُجَاهِدٍ، قَالَ ابْنُ عَبَّاسٍ أَمَرَهُ أَنْ يُسَبِّحَ، فِي أَدْبَارِ الصَّلَوَاتِ كُلِّهَا‏.‏ يَعْنِي قَوْلَهُ ‏[quran sura="50" aya_start="40" aya_end="40"]{‏وَأَدْبَارَ السُّجُودِ‏}‏

باب ‏<a href="https://quran.com/50/39-39">{‏وَسَبِّحْ بِحَمْدِ رَبِّكَ قَبْلَ طُلُوعِ الشَّمْسِ وَقَبْلَ الْغُرُوبِ‏}</a>‏

Narrated Mujahid:

Ibn `Abbas said, "Allah ordered His Prophet to celebrate Allah's praises after all prayers." He refers to 
His Statement: 'After the prayers.' (50.40)

The Statement of Allah the Exalted: "...And glorify the praises of your Lord, before the rising of the sun and before (its) setting (i.e., the Fajr, Ẓuhr and 'Aṣr prayers) ." (V.50:39)