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bukhari:4852Ādam > And Rqāʾ > Ibn Abū Najīḥ > Mujāhid > Ibn ʿAbbās Amarah

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

البخاري:٤٨٥٢حَدَّثَنَا آدَمُ حَدَّثَنَا وَرْقَاءُ عَنِ ابْنِ أَبِي نَجِيحٍ عَنْ مُجَاهِدٍ قَالَ ابْنُ عَبَّاسٍ أَمَرَهُ

أَنْ يُسَبِّحَ فِي أَدْبَارِ الصَّلَوَاتِ كُلِّهَا يَعْنِي قَوْلَهُ {وَأَدْبَارَ السُّجُودِ}