It was mentioned to 'Abdullah b. Umar (Allah be pleased with them) and he said: Allah's Apostle (ﷺ) effected separation between the two members of Banu al-'Ajlan.
Sahih Muslim Book 19, Hadith 9
← Previous Hadith I asked Ibn 'Umar (Allah be pleased with them) about invoking curse (li'an), and he narrated Similarly from Allah's Apostle (ﷺ).

Sahih Muslim Book 19, Hadith 8 Next Hadith → Nafi' reported on the authority of Ibn Umar (Allah be pleased with them) that a person invoked curse on the wife during the lifetime of Allah s Messenger (ﷺ), so he effected separation between them and traced the lineage of the son to his mother.

Sahih Muslim Book 19, Hadith 10