Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) says that the Messenger of Allah (peace and blessings be upon him) separated the two brothers of Banu al-Ajlan.
(b) He (peace and blessings be upon him) joined his index finger and middle finger and said: "Indeed, Allah knows that one of you is a liar; so is either of you ready to repent?"
(c) Sa'id bin Jubayr narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Prophet (peace and blessings be upon him) separated the two who performed li'an.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب اللعان / 15325