Habib bin al-Nu'man al-Asadi narrates from Sayyiduna Khuraym bin Fatik al-Asadi (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) led the morning prayer and stood up. Then he said: "False testimony is equal to associating partners with Allah." He said it three times, and recited this verse: "So avoid the filth of idols and avoid false speech, being upright for Allah, not associating partners with Him." [Surah al-Hajj: 30-31]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب آداب القاضي / 20383