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عَنْ مَحْمُودِ بْنِ لَبِيدٍ رضي الله عنه أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «إِنَّ أَخْوَفَ مَا أَخَافُ عَلَيْكُمُ الشِّرْكُ الْأَصْغَرُ» قَالُوا: وَمَا الشِّرْكُ الْأَصْغَرُ يَا رَسُولَ اللهِ؟ قَالَ: «الرِّيَاءُ، يَقُولُ اللهُ عز وجل لَهُمْ يَوْمَ الْقِيَامَةِ إِذَا جُزِيَ النَّاسُ بِأَعْمَالِهِمْ: اذْهَبُوا إِلَى الَّذِينَ كُنْتُمْ تُرَاؤُونَ فِي الدُّنْيَا، فَانْظُرُوا هَلْ تَجِدُونَ عِنْدَهُمْ جَزَاءً؟».

The Prophet (may Allah's peace and blessings be upon him) informs that what he fears most for his Ummah is minor Shirk, which is showing off, i.e., doing good deeds for the sake of people. Then, he (may Allah's peace and blessings be upon him) informs of the punishment of those who show off with their good deeds as it will be said to them on the Day of Judgment: Go to those for the sake of whom you offered your good deeds and see if they have the ability to reward you for such deeds.

• Good deeds must be devoted to Allah Almighty with full sincerity and warning of ostentation must be avoided.
• The Prophet's great compassion towards his Ummah and his keenness to guide and advise them.
• If this is the Prophet's fear for his Companions, who are the most noble in terms of righteousness, then, the fear for those who succeed them is far greater.

مسند أحمد (39/ 39) (23630). الجديد في شرح كتاب التوحيد، لمحمد القرعاوي (ص57). الملخص في شرح كتاب التوحيد، لصالح الفوزان (ص45).

عَنْ ‌مَحْمُودِ بْنِ لَبِيدٍ رضي الله عنه: أَنَّ ‌عُثْمَانَ بْنَ عَفَّانَ أَرَادَ بِنَاءَ الْمَسْجِدِ فَكَرِهَ النَّاسُ ذَلِكَ، وَأَحَبُّوا أَنْ يَدَعَهُ عَلَى هَيْئَتِهِ، فَقَالَ: سَمِعْتُ رَسُولَ اللهِ صَلَّى اللهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «مَنْ بَنَى مَسْجِدًا لِلهِ بَنَى اللهُ لَهُ فِي الْجَنَّةِ مِثْلَهُ».

'Uthmān ibn' Affān (may Allah be pleased with him) wanted to rebuild the Prophet's Mosque in a better way than its former state. But the people disliked that, as it would involve a change to the earlier condition of the Mosque's structure during the Prophet's lifetime. The Mosque was made of mud bricks, and its ceiling was made of palm branches. 'Uthmān, however, wanted to build it with stones and plaster. So, 'Uthmān (may Allah be pleased with him) informed them that he heard the Prophet (may Allah's peace and blessings be upon him) say: Whoever builds a mosque to win the pleasure of Allah Almighty, not for show-off or reputation, Allah will give him the best reward of the same kind of his deed. The reward is that Allah will build for him the like of it in Paradise.

• The Hadīth urges the construction of mosques and demonstrates the merit of doing so.
• The expansion and renovation of a mosque fall under the merit of building a mosque.
• It stresses the importance of sincerity to Allah Almighty in all deeds.

صحيح البخاري (1/ 97) (450)، صحيح مسلم (4/ 2287) (533)، المفهم لما أشكل من تلخيص كتاب مسلم (2/ 131)، شرح النّووي على مسلم (5/14)، التوضيح لشرح الجامع الصحيح (5/537)، البحر المحيط الثجاج في شرح صحيح الإمام مسلم بن الحجاج (12/ 171).