It is narrated from Sayyiduna Abu Mas'ud (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "The prayer of that person is not valid who does not straighten his back in bowing (ruku') and prostration (sajdah)."

It is narrated from Sayyiduna Abu Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) forbade the price of a dog, the earnings of an immoral woman, and eating sweets given to soothsayers.

It is narrated from Sayyiduna Abu Mas'ud (may Allah be pleased with him) that someone asked him, "What have you heard from the Prophet (peace and blessings of Allah be upon him) regarding the phrase 'people think'?" He replied: "It is the worst mount of a person."

Salim Al-Barrad (who is a trustworthy narrator) says that once Sayyiduna Abu Mas’ud Badri (may Allah be pleased with him) said to us,“Shall I not show you how the Prophet (peace and blessings be upon him) used to pray?”Saying this, he pronounced the takbir, placed both his palms on his knees in ruku’, kept the joints of his fingers open, and kept his hands away from his stomach, until every limb was settled in its place. Then, after saying «سمع الله لمن حمده» , he stood up straight until every limb was settled in its place. Then, pronouncing the takbir, he performed sajdah and kept his hands away from his stomach until every limb was settled in its place. Then, raising his head, he sat up straight until every limb was settled in its place. Then, he performed the second sajdah, and he prayed all four rak’ahs in this manner, and then said,“The Prophet (peace and blessings be upon him) used to pray like this.”

It is narrated from Sayyiduna Abu Mas'ud (may Allah be pleased with him) that a man came to the service of the Prophet (peace and blessings of Allah be upon him) and said: O Messenger of Allah! I think that because of so-and-so (the imam), I will miss the Fajr prayer out of fear of him. The narrator says: I have never seen the Prophet (peace and blessings of Allah be upon him) more angry during a sermon than on that day. The Prophet (peace and blessings of Allah be upon him) said: O people! Some of you make others dislike (the prayer). Whoever among you leads the people in prayer should make it light, for among the worshippers are the weak, the elderly, and those with needs.

Aamir says that (on the occasion of the Pledge of Aqabah) the Prophet (peace be upon him) along with his uncle Sayyiduna Abbas (may Allah be pleased with him) reached near seventy Ansar individuals under a tree at a mountain pass and said: Let your spokesman speak, but do not speak at length because the polytheists have appointed spies over you; if they find out, they will defame you. So one of them, that is, Abu Umamah, spoke: O Muhammad (peace be upon you)! First, present whatever demands you wish from your Lord, for yourself, and for your companions, then tell us what reward we will have from Allah and from you if we fulfill your demands? The Prophet (peace be upon him) said: For my Lord, I demand from you that you worship Him alone, associate nothing with Him, and for myself and my companions, I demand that you give us shelter, help us, and protect us just as you protect yourselves. They asked: If we do this, what will we get? The Prophet (peace be upon him) said: "You will get Paradise." They said: Then we have made this promise to you.

The previous hadith is also narrated from Sayyiduna Abu Mas'ud (may Allah be pleased with him) through this second chain of narration.

Imam Sha'bi (may Allah have mercy on him) said that neither any young nor old person would have heard such a sermon.

Salim Al-Barrad says that once Sayyiduna Abu Mas'ud (may Allah be pleased with him) said to us, "Shall I not show you how the Prophet (peace and blessings be upon him) used to pray?" Saying this, he pronounced the takbeer, placed both his palms on his knees in ruku', kept the fingers spread apart, and kept his hands away from his stomach, until every limb was settled in its place. Then he raised his head from ruku' and stood up straight, until every limb was settled in its place. Then, saying the takbeer, he performed sajdah and kept his hands away from his stomach. Then he raised his head and sat up straight until every limb was settled in its place. Then he performed the second sajdah, and after praying all four rak'ahs in this manner, he said, "The Prophet (peace and blessings be upon him) used to pray like this."

It is narrated from Sayyiduna Abu Mas'ud (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "When a Muslim spends on his family seeking reward, then that spending is also charity."