Silsilah as-Sahihah 474 — Prayer is the criterion for acceptance

It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that he said: The Messenger of Allah (peace and blessings be upon him) said: "On the Day of Resurrection, the first thing among the rights of Allah for which people will be called to account will be the prayer, and among the rights of the servants, the first matter to be decided will be concerning blood (i.e., murder)."