Weak
graded by Al-Albani
Mishkat al-Masabih 2178
Narrator:Ma‘qil ibn Yasār
وَعَن معقل بن يسَار الْمُزنِيّ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «مَنْ قَرَأَ (يس) ابْتِغَاءَ وَجْهِ اللَّهِ تَعَالَى غُفِرَ لَهُ مَا تَقَدَّمَ مِنْ ذَنبه فاقرؤوها عِنْدَ مَوْتَاكُمْ» . رَوَاهُ الْبَيْهَقِيُّ فِي شُعَبِ الْإِيمَانِ
Ma'qil b. Yasār al-Muzanī reported the Prophet as saying, “If anyone recites Yā’ Sīn (Qur’ān, 36) out of a desire for God's favour, his past sins will be forgiven him; so recite it over those of you who are dying.” Baihaqī transmitted it in Shu'ab al-īmān.
Cited in Mishkat al-Masabih (No. 2178).