It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever builds a mosque for the sake of Allah, the Mighty and Majestic, even if it is as small as the nesting hollow of a sandgrouse (a desert bird's spot for brooding its eggs), Allah, the Mighty and Majestic, will build for him in return a house in Paradise."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-A'mash except Sharik, and Ishaq (bin Yusuf al-Azraq) is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الألف / 1857
Hadith Gradingمحدثین:غريب، تفرد به إسحاق
Hadith Takhrij«قال الطبراني: لم يروه عن الأعمش إلا شريك تفرد به إسحاق «الإعلام بسنته عليه الصلاة والسلام بشرح سنن ابن ماجه الإمام، ج 4، ص 168»» «أخرجه الترمذي فى «جامعه» برقم: 319، وأبو يعلى فى «مسنده» برقم: 4018، 4298»