عَنْ عَبْدِ اللَّهِ بْنِ عَمْرٍو رَضِيَ اللَّهُ عَنْهُمَا أَنَّ رَجُلًا جَاءَ إِلَى النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ فَقَالَ يَا رَسُولَ اللَّهِ مَا عَمَلُ الْجَنَّةِ قَالَ الصِّدْقُ وَإِذَا صَدَقَ الْعَبْدُ بَرَّ وَإِذَا بَرَّ آمَنَ وَإِذَا آمَنَ دَخَلَ الْجَنَّةَ قَالُوا يَا رَسُولَ اللَّهِ مَا عَمَلُ النَّارِ قَالَ الْكَذِبُ إِذَا كَذَبَ فَجَرَ وَإِذَا فَجَرَ كَفَرَ وَإِذَا كَفَرَ دَخَلَ يَعْنِي النَّارَ
It is narrated from Sayyiduna Abdullah bin Amr (may Allah be pleased with them both) that a man came to the Noble Prophet (peace and blessings be upon him) and said: O Messenger of Allah! What are the deeds of Paradise? He (peace and blessings be upon him) said: Truthfulness. When a servant speaks the truth, he does good; when he does good, he becomes a believer; and when he becomes a believer, he enters Paradise. The people said: O Messenger of Allah! What are the deeds of the Fire? He (peace and blessings be upon him) said: Falsehood. When a servant lies, he does evil; when he does evil, he becomes a disbeliever; and when he becomes a disbeliever, he enters the Fire.