Friday

Abu Huraira reported Allah's Messenger (ﷺ) as saying:

There is a time on Friday at which no Muslim servant would pray and would ask Allah for a thing (that is good) but He would give it to him. Qutaiba pointed with the help of his hand that it (the time) is short.

USC-MSA web (English) reference

: Book 4, Hadith 1849

The mercy of ALLAH (SWT)

On the authority of Anas (may Allah be pleased with him), who said:

I heard the Messenger of Allah (ﷺ) say: Allah the Almighty said: O son of Adam, so long as you call upon Me and ask of Me, I shall forgive you for what you have done, and I shall not mind. O son of Adam, were your sins to reach the clouds of the sky and were you then to ask forgiveness of Me, I would forgive you. O son of Adam, were you to come to Me with sins nearly as great as the earth and were you then to face Me, ascribing no partner to Me, I would bring you forgiveness nearly as great as it. 

It was related by at-Tirmidhi (also by Ahmad ibn Hanbal). Its chain of authorities is sound.

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Fasting

Yahya related to me from Malik from Abu'z Zinad from al-Araj from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "By the One in Whose hand my self is, the smell of the breath of a man fasting is better with Allah than the scent of musk.' He leaves his desires and his food and drink for My sake. Fasting is for Me and I reward it. Every good action is rewarded by ten times its kind, up to seven hundred times, except fasting, which is for Me, and I reward it.' "

Ramadan

It was narrated from Ibn Shahab that Abu Salamah told him that Abu Hurairah said:

"The Messenger of Allah said: 'Whoever spends the nights of Ramadan in prayer (Qiyam) out of faith and in the hope of reward, he will be forgiven his previous sins." '

In-book reference

: Book 22, Hadith 108

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