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
← Previous Hadith Allah knows that one of you is a liar. Is there one to repent among you?

Sahih Muslim Book 19, Hadith 7 Next Hadith → 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