Umar bin Abu Bakr bin Abdur Rahman narrates: Sayyiduna Ammar bin Yasir (may Allah be pleased with him) performed two rak'ahs. He performed them briefly, so Abdur Rahman bin Harith said to him: O Abu Yaqzan, I have seen that you performed a brief prayer. He replied: I completed them before any distractions could come, because I heard the Prophet Muhammad (peace and blessings be upon him) say: "A person performs prayer, and his share from the prayer is only a tenth, or a ninth, or an eighth, or a seventh, or a sixth, until it reaches the number one." (Imam Ibn Hibban, may Allah have mercy on him, says:): The chain of this hadith may mislead someone who is not proficient in the science of hadith into thinking that its chain is disconnected and not continuous. However, this is not the case, because Umar bin Abu Bakr narrated this from his grandfather Abdur Rahman bin Harith, from Sayyiduna Ammar bin Yasir (may Allah be pleased with him), as Ubaidullah bin Umar has stated. Umar bin Abu Bakr did not narrate this directly from Sayyiduna Ammar (may Allah be pleased with him).