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.'" (FR)
English reference (FR): Vol. 1, Book 5, Hadith 995 (FR)
Arabic reference (FR): Book 5, Hadith 1048 (FR)