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Grade : Sahih (Abu Ghuddah)
أَخْبَرَنِي مُحَمَّدُ بْنُ وَهْبٍ، قَالَ حَدَّثَنِي مُحَمَّدُ بْنُ سَلَمَةَ، قَالَ حَدَّثَنِي أَبُو عَبْدِ الرَّحِيمِ، قَالَ حَدَّثَنِي زَيْدٌ، عَنْ أَيُّوبَ، - وَهُوَ ابْنُ عَائِذٍ - عَنْ بُكَيْرِ بْنِ الأَخْنَسِ، عَنْ مُجَاهِدٍ أَبِي الْحَجَّاجِ، عَنِ ابْنِ عَبَّاسٍ، قَالَ فُرِضَتْ صَلاَةُ الْحَضَرِ عَلَى لِسَانِ نَبِيِّكُمْ صلى الله عليه وسلم أَرْبَعًا وَصَلاَةُ السَّفَرِ رَكْعَتَيْنِ وَصَلاَةُ الْخَوْفِ رَكْعَةً .
It was narrated that Ibn 'Abbas said:"The prayer of the resident was enjoined on the tongue of your Prophet (ﷺ), four (rak'ahs), and the prayer of the traveler is two rak'ahs, and the prayer of fear is one rak'ah
"When a person dies, his works end, except for three: ongoing charity, knowledge that is benefited from, and a righteous child who prays for him."
Prophet Mohammed (PBUH)
"The best of what a man leaves behind are three: a righteous child who supplicates for him, ongoing charity the reward of which reaches him, and knowledge that is acted upon after him."
Sunan Ibn Mājah
"Every day two angels come down from Heaven and one of them says, 'O Allah! Compensate every person who spends in Your Cause,' and the other (angel) says, 'O Allah! Destroy every miser.'"
Sahih Bukhari