Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Whoever does not give up false speech, acting upon it and ignorant behaviour, Allah Almighty has no need of his giving up his food and drink."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8311