Bulugh al-Maram 2 The Book of Prayer كتاب الصلاة 122

وَلَهُمَا : مِنْ حَدِيثِ عَائِشَةَ -رَضِيَ اَللَّهُ عَنْهَا- : { كَانُوا إِذَا مَاتَ فِيهِمْ اَلرَّجُلُ اَلصَّالِحُ بَنَوْا عَلَى قَبْرِهِ مَسْجِدًا } وَفِيهِ : { أُولَئِكَ شِرَارُ اَلْخَلْقِ } 1 1 – صحيح . رواه البخاري (427) ، ومسلم (528) .

Narrated ‘Aishah (RA) in al-Bukhari and Muslim [that Allah’s Messenger (صلى الله عليه وسلم) said], “When a pious person amongst them (the Jews and Christians) died they used to build a place of worship and prostration on his grave.” In the same Hadith is: “Those are the worst of creatures.”