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suyuti:604-5bYaʿlá b. Sayābah
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السيوطي:٦٠٤-٥b

"عَنْ يَعْلَى بْن سَيَابَةَ أنَّ النَّبِىَّ ﷺ مَرَّ بِقَبْر يُعَذَّبُ فِى غَيْر كَبِير، ثُمَّ دَعَا بِجَرِيَدِةٍ فَوَضَعَهَا عَلَى قَبْرهِ فَقَالَ: لَعَلهُ يُخَففُ عَنْهُ مَا كَانَتْ رَطبَةً".  

[ق] البيهقى في السنن في كتاب عذاب القبر

See similar narrations below:

Collected by Aḥmad
ahmad:17560Sulaymān b. Ḥarb > Ḥammād > ʿĀṣim b. Bahdalah > Ḥabīb b. Abū Jubayrah > Yaʿlá b. Siyābah

[Machine] The Prophet ﷺ passed by a grave and said, "Indeed, the owner of this grave is being punished in a lesser form of torment." Then he called for a leaf and placed it on the grave, saying, "Perhaps it will alleviate his punishment as long as it remains moist."  

أحمد:١٧٥٦٠حَدَّثَنَا سُلَيْمَانُ بْنُ حَرْبٍ حَدَّثَنَا حَمَّادٌ عَنْ عَاصِمِ بْنِ بَهْدَلَةَ عَنْ حَبِيبِ بْنِ أَبِي جُبَيْرَةَ عَنْ يَعْلَى بْنِ سِيَابَةَ

أَنَّ النَّبِيَّ ﷺ مَرَّ بِقَبْرٍ فَقَالَ إِنَّ صَاحِبَ هَذَا الْقَبْرِ يُعَذَّبُ فِي غَيْرِ كَبِيرٍ ثُمَّ دَعَا بِجَرِيدَةٍ فَوَضَعَهَا عَلَى قَبْرِهِ فَقَالَ لَعَلَّهُ أَنْ يُخَفَّفَ عَنْهُ مَا دَامَتْ رَطْبَةً