Abdullah bin Zubair (may Allah be pleased with him) narrates that the Messenger of Allah (ﷺ), after concluding the prayer with salam, would recite aloud: "There is no deity except Allah, He is alone, He has no partner, to Him belongs the dominion and to Him belongs all praise, and He is over all things competent. Abstaining from sins and having the ability to worship is only possible through Allah’s help. And we worship only Him, every blessing belongs to Him, and all bounty is His possession, all good praise is for Him. There is no (true) deity except Allah, we (only) worship Him even if the disbelievers dislike it."
Hadith Referenceمسند الإمام الشافعي / كتاب الصلاة / 267
Hadith Takhrijأخرجہ مسلم، المساجد، باب استحباب الذکر بعد الصلاۃ و بیان صفتہ (594)۔