Mishkat al-Masabih 8 The Excellent Qualities of the Qur’an كتاب فضائل القرآن 38

وَعَنْ أَنَسٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّ لِكُلِّ شَيْءٍ قَلْبًا وَقَلْبُ الْقُرْآنِ (يس) وَمَنْ قَرَأَ (يس) كَتَبَ اللَّهُ لَهُ بِقِرَاءَتِهَا قِرَاءَةَ الْقُرْآنِ عَشْرَ مَرَّاتٍ» . رَوَاهُ التِّرْمِذِيُّ وَالدَّارِمِيُّ وَقَالَ التِّرْمِذِيُّ هَذَا حَدِيثٌ غَرِيب

Anas reported God’s messenger as saying, “Everything has a heart, and the heart of the Qur’ān is Yā Sīn (Qur’ān, 36). God will record anyone who recites Yā Sīn as having recited the Qur’ān ten times.” Tirmidhī and Dārimī transmitted it, Tirmidhī saying this is a gharīb tradition.