Bulugh al-Maram — Hadith #52412

On the authority of Abdullah ibn Amr ibn al-As, may God be pleased with them both, that the Messenger of God, peace and blessings be upon him, stood during the Farewell Pilgrimage, and people began asking him questions. A man said, “I was unaware, so I shaved my head before sacrificing.” He said, “Sacrifice, there is no harm in it.” Then another man came and said, “I was unaware, so I sacrificed before stoning the pillars.” He said, “Stone the pillars, there is no harm in it.” He was not asked again. On that Day, regarding anything done early or late, He will say, "Do it, and there is no blame upon you." (Agreed upon. 1.1 - Authentic. Narrated by Al-Bukhari (83) and Muslim (1306)).