Abu Huraira radhiAllahu ‘anhu reported the Messenger of Allah salAllahu ‘alayhi wa sallam said,
“The five prayers and from one Friday prayer to (the next) Friday prayer, is an expiation (of the sins committed in between them) if major sins are not committed.” [Saheeh Muslim, Vol. 1, p. 151-2, # 448]
The reward which Allah subhanahu wa ta’ala has promised in the above hadeeth, is that the person who offers the two Friday Prayers shall have his minor sins he committed in the day between these two prayers forgiven. It should be borne in mind, however, that he must keep away from the major sins.
Supplication is accepted on Friday
Abu Huraira radhiAllahu ‘anhu reported that the Apostle of Allah salAllahu ‘alayhi wa sallam said,
“The best day on which the sun has risen is Friday…and it contains a time at which, no Muslim prays and asks anything from Allah, but He will give it to him.”
Ka’ab said, “That is one day every year.” So I said, “It is on every Friday!” Ka’ab read the Torah and said, “The Apostle of Allah salAllahu ‘alayhi wa sallam has spoken the truth.” Abu Huraira radhiAllahu ‘anhu said, “I met ‘Abdullah ibn Salaam and told him of my meeting with Ka’ab. ‘Abdullah ibn Salaam said, ‘It is at the very end of Friday!’ I asked, ‘How can it be, when the Apostle of Allah salAllahu ‘alayhi wa sallam has said, “No Muslim finds it while he is praying…” and this is the moment when no prayer is offered?’ ‘Abdullah ibn Salaam said, ‘Has the Apostle of Allah salAllahu ‘alayhi wa sallam not said, “If anyone is seated waiting for the prayer, he is engaged in the prayer until he observes it.” I said, ‘Yes, it is so!’” [Sunan Abu Daw’oud, Vol. 1, p.269, # 1041. Saheeh Sunan Abu Daw’oud Vol. 1, p. 195, # 924]
Jabir ibn ‘Abdullah narrated the Prophet salAllahu ‘alayhi wa sallam said,
“Friday is divided into twelve hours. Among them there is an hour in which, a Muslim does not ask Allah for anything but He gives it to him. So seek it in the last hour after the afternoon prayer.” [Sunan Abu Daw’oud, Vol. 1, p. 270, # 1043. Saheeh Sunan Abu Daw’oud, Vol. 1, p. 196, # 926]
There is a great deal of difference of opinion among the scholars as to exactly when this hour occurs. The strongest opinion is, that this hour is at the very end of the day before sunset. The second most acceptable opinion is that this hour should be considered as hidden like Layla-tul-Qadr, and the whole day should be spend in supplication and glorification of Allah subhanahu wa ta’ala. And the third most acceptable opinion is that this hour is found during the period when the Imam is seated (for giving Friday sermon) until the prayer is finished.
The purpose of hiding this moment on Friday is that people should remain engaged in supplication and prayer all day long. Had it been explained, people would not have made efforts in seeking it.
Book: Etiquettes of a Muslim on Friday, Abu Ibraheem Majeed Alee Hassan