Sahih al Bukhari 6513
To make the Heart Tender (Ar-Riqaq)
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ عَبْدِ رَبِّهِ بْنِ سَعِيدٍ، عَنْ مُحَمَّدِ بْنِ عَمْرِو بْنِ حَلْحَلَةَ، حَدَّثَنِي ابْنُ كَعْبٍ، عَنْ أَبِي قَتَادَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مُسْتَرِيحٌ، وَمُسْتَرَاحٌ مِنْهُ، الْمُؤْمِنُ يَسْتَرِيحُ ".
Narrated Abu Qatada:The Prophet (ﷺ) said, "Relieved or relieving. And a believer is relieved (by death)
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.