Whoever begins the voluntary prayer at the time of the sun's yellowing and its weakness - when the eye can face it - his prayer is valid but disliked in a prohibitive sense. It was narrated from Uqbah ibn Amir al-Juhani, may Allah be pleased with him, that he said: "There are three times when the Messenger of Allah, peace be upon him, forbade us to pray or to bury our dead: when the sun rises until it is fully risen, when the sun is at its zenith until it moves, and when the sun is setting until it sets," in Sahih Muslim 1: 568, Musnad al-Mustakhraj 2: 424, Sahih Ibn Hibban 3: 348, Sunan al-Tirmidhi 3: 348, and Sunan Abu Dawood 3: 208. And from Ibn Abbas, may Allah be pleased with them, he said: "Witnesses whom I approve of testified to me, and the one I approve of the most is Umar, that the Prophet, peace be upon him, forbade praying after the dawn prayer until the sun rises and after the afternoon prayer until the sun sets," in Sahih al-Bukhari 1: 211. See: Maraqi al-Falah, pp. 186-187.