Hadith: Direct me to a deed that will make me enter Paradise if I do it. He said: "Worship Allah and do not associate anything with Him, establish the prescribed prayer, pay the obligatory Zakah, and fast Ramadān

عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ:
أَنَّ أَعْرَابِيًّا أَتَى النَّبِيَّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ، فَقَالَ: دُلَّنِي عَلَى عَمَلٍ إِذَا عَمِلْتُهُ دَخَلْتُ الجَنَّةَ، قَالَ: «تَعْبُدُ اللَّهَ لاَ تُشْرِكُ بِهِ شَيْئًا، وَتُقِيمُ الصَّلاَةَ المَكْتُوبَةَ، وَتُؤَدِّي الزَّكَاةَ المَفْرُوضَةَ، وَتَصُومُ رَمَضَانَ» قَالَ: وَالَّذِي نَفْسِي بِيَدِهِ لاَ أَزِيدُ عَلَى هَذَا، فَلَمَّا وَلَّى قَالَ النَّبِيُّ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ: «مَنْ سَرَّهُ أَنْ يَنْظُرَ إِلَى رَجُلٍ مِنْ أَهْلِ الجَنَّةِ، فَلْيَنْظُرْ إِلَى هَذَا».
[صحيح] - [متفق عليه] - [صحيح البخاري: 1397]

Abu Hurayrah (may Allah be pleased with him) reported:
A Bedouin came to the Prophet (may Allah's peace and blessings be upon him) and said: Direct me to a deed that will make me enter Paradise if I do it. He said: "Worship Allah and do not associate anything with Him, establish the prescribed prayer, pay the obligatory Zakah, and fast Ramadān." He said: By the One in Whose Hand my soul is, I will not do more than this. When he left, the Prophet (may Allah's peace and blessings be upon him) said: "Whoever is pleased to look at a man from the dwellers of Paradise, let him look at this."
[Authentic hadith] - [Narrated by Bukhari & Muslim] - [Sahih Bukhari - 1397]

Explanation

A Bedouin came to the Prophet (may Allah's peace and blessings be upon him) to guide him to a deed that would make him enter Paradise. The Prophet (may Allah's peace and blessings be upon him) answered him saying that being admitted to Paradise and saved from Hellfire are contingent on observing the pillars of Islam, which include worshipping Allah alone without associating partners with Him, establishing the five prayers that Allah has made obligatory upon His slaves every day and night, paying Zakah due on your wealth that Allah has made obligatory upon you and giving it to those entitled to have it, and maintaining the fast during the month of Ramadān in its due time. The man said: By the One in Whose Hand my soul is, I shall not add any act of obedience to these obligatory acts, which I heard from you, or deduct anything therefrom. When the man left, the Prophet (may Allah's peace and blessings be upon him) said: Whoever is pleased to look at a man from the dwellers of Paradise, let him look at this Bedouin.