Sayyiduna Samurah bin Jundub (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "Whoever leaves the Friday prayer without an excuse should give one dinar in charity, and if he cannot find it, then half a dinar."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5989