Sayyiduna Ka'b bin Ujrah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) came out to us in the mosque while we were seven men, four Arabs and three of the mawali (freed slaves and clients). He (peace and blessings be upon him) sat down and said: "Do you know what your Lord said?" We said: "Allah and His Messenger know best." He (peace and blessings be upon him) said: "Whoever prays the prayer at its time and does not abandon it, belittling it, will meet Me on the Day of Resurrection having a covenant with Me by which I will admit him to Paradise. And whoever does not pray it at its time and abandons it, belittling it, will meet Me on the Day of Resurrection having no covenant with Me; if I wish I will punish him, and if I wish I will forgive him."
Hadith Referenceالمعجم الكبير للطبراني / باب الكاف / 16363