It is narrated from the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), that the Messenger of Allah (peace and blessings be upon him) said: "Whoever fills an empty space in a row, Allah raises him a rank because of it and builds for him a house in Paradise."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from al-Maqburi except Ibn Abi Dhi'b, and no one narrated it from Ibn Abi Dhi'b except Muslim bin Khalid; Ahmad bin Muhammad al-Qawwas is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5797
Hadith Gradingمحدثین:إسناده ضعيف لضعف مسلم بن خالد الزنجي
Hadith Takhrij«قال الهيثمي: فيه مسلم بن خالد الزنجي وهو ضعيف وقد وثقه ابن حبان «مجمع الزوائد ومنبع الفوائد، ج 2، ص 91»»