It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Jibril came to me, and in his hand was something like a white mirror with a black spot in it. I asked: 'O Jibril, what is this?' He said: 'This is Friday (Jumu'ah), which your Lord has sent to you so that it may be an Eid for you and for your Ummah after you.' I asked: 'What (reward) is there in it for us?' He said: 'There is abundant good in it for you; you are the last (to come in the world), but you will be the foremost on the Day of Resurrection. And in it there is an hour in which, if any Muslim servant, while in prayer, asks Allah for anything, Allah will surely grant it to him.' I asked: 'What is this black spot?' He said: 'This is the Hour (of Resurrection), which will be established on Friday; it is the chief of all days, and we call it the Day of Increase (Yawm al-Mazid).' I asked: 'O Jibril, what is meant by the Increase (al-Mazid)?' He said: 'It is that your Lord has made in Paradise a vast, spacious valley of white musk. When Friday comes among the days of the Hereafter, the Lord, the Blessed and Exalted, descends from His Throne to His Kursi, and pulpits of light are set around the Kursi, on which the Prophets sit; and chairs of gold are placed around the pulpits, on which the martyrs sit; while the people of the lofty chambers come out of their chambers and sit on dunes of musk. In that gathering they do not feel that the people of the pulpits and chairs have any superiority over them. Then Allah, the Possessor of Majesty and Honour, manifests Himself to them and says: "Ask of Me." They say: "O Lord, we ask You for Your pleasure." Allah says: "It is My pleasure that has settled you in this abode of Mine and granted you My honour." Then He says: "Ask of Me." They all say together: "We ask You for Your pleasure." So He makes them witnesses to His pleasure. Then He says: "Ask of Me." They ask Him until every servant's wish is fulfilled. Then there is revealed to them what no eye has seen, no ear has heard, and what has never occurred to the heart of any human being.'"
Imam al-Tabarani (may Allah have mercy on him) said: "No one but al-Walid bin Muslim narrated this hadith from Ibn Thawban."
Hadith Referenceالمعجم الأوسط / باب الميم / 6717
Hadith Takhrij«أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 2291، وأبو يعلى فى «مسنده» برقم: 4089، 4228، والبزار فى «مسنده» برقم: 7527، وابن حجر فى «المطالب العالية» برقم: 673 / 1، 673 / 2، 673 / 3، 673 / 4، وعبد الرزاق فى «مصنفه» برقم: 5559، وابن أبي شيبة فى «مصنفه» برقم: 5560، 5561، والطبراني فى «الكبير» برقم: 35، والطبراني فى «الأوسط» برقم: 2084، 7307»