From Sahih Bukhari (Hadith 6404):
Narrated `Amr bin Maimun:Whoever recites it (i.e., the invocation in the above Hadith (412) ten times will be as if he manumitted one of Ishmael's descendants. Abu Aiyub narrated the same Hadith from the Prophet (ﷺ) saying, "(Whoever recites it ten times) will be as if he had manumitted one of Ishmael's descendants
Reference: Bukhari 6404