PROPHET MUHAMMAD (ﷺ) said:
Whoever recites Aayat al-Kursi (QURAN 2:255) immediately after each prescribed prayer, there will be nothing standing between him and his entering Paradise except death.

TRANSLATION:
Allah - there is no deity except Him, the Ever-Living, the Sustainer of [all] existence. Neither drowsiness overtakes Him nor sleep. To Him belongs whatever is in the heavens and whatever is on the earth. Who is it that can intercede with Him except by His permission? He knows what is [presently] before them and what will be after them, and they encompass not a thing of His knowledge except for what He wills. His Kursi extends over the heavens and the earth, and their preservation tires Him not. And He is the Most High, the Most Great.

Narrated Abu Huraira:
The people said, "O Allah's Messenger (ﷺ)! The rich people have got the highest degrees of prestige and the permanent pleasures (in this life and the life to come in the Hereafter)." He said, "How is that?" They said, "The rich pray as we pray, and strive in Allah's Cause as we do, and spend from their surplus wealth in charity, while we have no wealth (to spend likewise)." He said, "Shall I not tell you a thing, by doing which, you will catch up with those who are ahead of you and supersede those who will come after you; and nobody will be able to do such a good deed as you do except the one who does the same (deed as you do). That deed is to recite 'Subhan Allah ten times, and 'Al-Hamdulillah ten times, and 'Allahu Akbar' ten times after every prayer."

It was narrated from Abu Hurairah - and this is the Hadith of Qutaibah - that the poor Muhajirin came to the Messenger of Allah and said: "The people of great wealth have taken the highest ranks and eternal bliss." He said: "Why is that?" They said: "They offer
Salat as we offer Salat and they fast as we fast, but they give in charity and we do not, and they free slaves and we do not." The
Messenger of Allah said: "Shall I not teach you something by means of which you may catch up with those who have gone ahead of you, and go ahead of those who come after you, and there will be no one who is better than you except those who do as you do?" They said: Yes, Messenger of Allah. "He said: "Glorify Allah, extol His greatness, and praise Him at the end of every prayer, thirty-three times." “Suhail said: 'Eleven (times each), eleven (times each), and all of that adds up to thirtythree.’"

(SAHIH MUSLIM Vol #2, Hadith #1348)

Narrated Abu Hurairah
Some poor people came to the Prophet and said, "The wealthy people will get higher grades and will have permanent enjoyment, and they offer Salat (prayer) like us and observe Saum (fast) as we do. They have more money by which they perform the Hajj, and 'Umra; fight and struggle in Allah's Cause and give in charity." The Prophet said, "Shall I not tell you a thing upon which if you acted you would catch up with those who have surpassed you? Nobody would overtake you and you would be better than the people amongst whom you live except those who would do the same. Say Subhan Allah, Alhamdu-lillah and Allahu Akbar thirty-three times each after every (compulsory) Salat (prayer) ." We differed and some of us said that we should say Subhãn Allah thirty three times and Alhamdu lillãh thirty-three times and Allahu Akbar thirty-four times. I went to the Prophet who said, "Say, Subhan Allah and Alhamdulillah and Allahu Akbar all of them for thirty three times."