Sunan an-Nasa'i
Sunan an-Nasa'i 2542
أَخْبَرَنَا مَحْمُودُ بْنُ غَيْلاَنَ، قَالَ حَدَّثَنَا وَكِيعٌ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عُمَارَةَ بْنِ الْقَعْقَاعِ، عَنْ أَبِي زُرْعَةَ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَجُلٌ يَا رَسُولَ اللَّهِ أَىُّ الصَّدَقَةِ أَفْضَلُ قَالَ " أَنْ تَصَدَّقَ وَأَنْتَ صَحِيحٌ شَحِيحٌ تَأْمُلُ الْعَيْشَ وَتَخْشَى الْفَقْرَ " .
Mahmud ibn Ghaylan reported: Waki narrated to us: Sufyan narrated to us, from Umarah ibn al-Qaqa, from Abu Zurah, from Abu Hurayrah, who said: A man asked: O Messenger of Allah, which charity is best? He said: That you give charity while you are healthy and miserly, hoping for a long life and fearing poverty.
Translation notes
The source ties the best time for charity to health, attachment to wealth, hope for continued life, and fear of poverty.