Sayyiduna Imran bin Husayn (may Allah be pleased with him) reports that the Prophet (peace and blessings be upon him) said: "Whoever deliberately swears a false oath, let him prepare to take his place in Hell."
Al-Tabarani recorded it in al-Mu'jam al-Kabir; its chain contains Umar bin Ibrahim al-Abdi, who is thiqah (trustworthy), though he has been criticised.