It wasnarrated that 'Aishah said:
"The Messenger of Allah (ﷺ)said:'Allah and His angels send blessings upon those who complete therows, and whoever fills a gap, Allah will raise him one degree instatus thereby.'" (DE)
English reference (DE): Vol. 1, Book 5, Hadith 995 (DE)
Arabic reference (DE): Book 5, Hadith 1048 (DE)