Salim reported on the authority of his father that Allah's Messenger (ﷺ) said: A Muslim is the brother of a fellow-Muslim. He should neither commit oppression upon him nor ruin him, and he who meets the need of a brother, Allah would meet big needs, and he who relieved a Muslim from hardship Allah would relieve him from the hardships to which he would be put on the Day of Resurrection, and he who did not expose (the follies of a Muslim) Allah would conceal his follies on the Day of Resurrection.

Abdullah ibn Amr reported: The Messenger of Allah, peace and blessings be upon him, said:
The merciful will be shown mercy by the Most Merciful. Be merciful to those on the earth and the One in the heavens will have mercy upon you.

Ibn Umar reported:

The Messenger of Allah, peace and blessings be upon him, said, “Gabriel did not stop instructing me to treat neighbors well until I thought he would make them my heirs.”

Anas ibn Malik reported: The Messenger of Allah, peace and blessings be upon him, said:
اللَّهُ أَفْرَحُ بِتَوْبَةِ عَبْدِهِ مِنْ أَحَدِكُمْ سَقَطَ عَلَى بَعِيرِهِ وَقَدْ أَضَلَّهُ فِي أَرْضِ فَلَاةٍ
Allah is more joyful with the repentance of his servant than one of you who has lost his camel on a journey in an empty desert while it carries his food and drink.

Uthman bin 'Affan (May Allah be pleased with him) reported:
I heard the Messenger of Allah (ﷺ) saying: "One who performs 'Isha' prayer in congregation, is as if he has performed Salat for half of the night. And one who performs the Fajr prayer in congregation, is as if he has performed Salat the whole night."

Messenger of Allah (ﷺ) said, "(In the past) I forbade you from visiting graves, but visit them now.” In another narration Messenger of Allah (ﷺ) said, "Whoever wants to visit a graveyard, let him do so, because it reminds us of the Hereafter.”

When two Muslims meet (give salaam), and shake hands, they are forgiven their sins before they part (with each other).”

Abu Dharr reported:

The Messenger of Allah, peace and blessings be upon him, said, “Smiling in the face of your brother is your charity. Enjoining good and forbidding evil is charity. Guiding a lost man through the land is your charity. Lending your eyesight to a man who cannot see well is your charity. Removing rocks, thorns, and bones from the road is your charity. Pouring your leftovers into the vessel of your brother is your charity.”

Narrated Abu Hurairah (RA):
The Prophet (ﷺ) said: "Give gifts to one another and you will love one another."