The Prophet Peace be Upon Him said, Whoever memorized Forty Ahadis about the Deen to relate to my Ummah, Allah (on the Day of Judgement) will raise him as a Faiqh and I will intercede for him on the Day of Jundgement and will be a witness on his behalf. (Mishkat)

1) Before speaking the salaam should be said. (Tirmizi)
2) Spread the salaam amongst yourselves. (Muslims, Tirmizi, Ibn-e-Majah, Ahmad bin Hanmbal)
3) Whoever sends one durood upon me, Allah sends ten blessings (durood) upon him. (Tirmizi, Abu Dawood, Mishkat)
4) My intercession is for the big sinners in my Ummah. (Tirmizi, Abu Dawood, Mishkat)
5) Fast after sighting the moon (for the month of Ramadan) and do iftar (Eid) after the moon-sighting. (Bukhari and Muslim)
6) Cleanliness is a part of the Faith. (Tirmizi)
7) Duaa is the kernel of ibadat. (Tirmizi)
8) Actions depend on their intention. (Bukhari and Muslim)
9) A muslim is he from whose tongue and hands a Muslim is safe. (Bukhari and Muslim)
10) The best of you is the one who learned and taught the Quran. (Bukhari, Muslim, Ibn-e-Majah, and Darmi)
11) Modesty is a part of faith. (Muslim)
12) When Allah intends good for someone he makes them a Faqih. (Bukhari, Muslim, and Mishkat)
13) Be quiet, when the Imam does the qirat (recitation of the Holy Quran). (Musnad-e-Imam-e-Azam)
14) (In Salah) whoever has an Imam, the qirat of the Imam is the qirat of the Muqtadee (it is sufficient for the Muqtadee). (Musnad-e-Imam-e-Azam, Ibn-e-Majah)
15) Visit the graves because they remind one of the Akhirah. (Muslim, Tirmizi, Ibn-e-Majah, Nisaee)
16) A Muslim is a brother of a Muslim. (Bukhari, Muslim, Tirmizi, and Ibn-e-Majah)
17) To learn the Knowledge of the Deen is fard upon every Muslim man and woman. (Ibn-e-Majah)
18) Salah is a pillar of the Deen. (Tabrani)
19) Whoever is deprived of tenderness (unto others) is depreived of good. (Muslim)
20) Relate on my behalf even if it is an Ayah. (Bukhari)
21) Whoever remains quiet attains salvation. (Tirmizi)
22) The punishment of the Grave is Haq (the Truth). (Ahmad bin Hanmbal)
23) The influence of the gaze is Haq [the Truth]. (Bukhari, Muslim, Tirmizi, Abu Dawood, and Ahamd bin Hanbal)
24) Religion is the name of well-wishing. (Bukhari)
25) Announce your Nikkah (marriage). (Tirmizi, Ibn-e-Majah, Ahmad Bin Hanmbal)
26) Nikkah [marriage] is my Sunnat. (Ibn-e-Majah)
27) Whoever turns from my sunnah is not from me. (Bukhari, Muslim, Nisaee)
28) The one who guides [others] towards good deeds is like the one who [acutally] does them. (Jamus Sageer)
29) Duaa rids calamity.
30) I distribute (to people) and Allah gives. (Bukhari, Muslim, and Mishkat)
31) To be ashamed (of sins) is repentence. (Ibn-e-Majah, Ahmed bin Hanmbal, and Fatawa-e-Razaviyah)
32) It is because of those Awliya (Friends) of Allah that it rains and it is because of them that Rizq (sustenance) is given.
33) He who deos not have mercy, recives no mercy upon himself. (Bukhari, Muslim, Tirmizi, Abu Dawood, Ahmad bin Hunmbal)
34) Undoubtedly, the Holy Prophet read 20 rakats (cycles of prayer), not including Witr. (Tabrani, Bahiqi)
35) It is enough for a person to be a liar if he narrates (tells) everything he hears (without proper investigation). (Muslim)
36) Fasting is a shield (from sins). (Tirmizi, Nisaee)
37) This (Qurbani) is the sunnat of your father, Ibraheem (Alahis Salaam).
38) Undoubtedly, Allah has made it haraam for the earth to eat the bodies of the Prophets therefore Allah's Prophets are alive and they are given Rizq (sustenance). (Ibn-e-Majah, Mishkat)
39) The best sadqa is that a muslim man learns knowlege [of the Deen] and then teaches it to his Muslim brothers. (Ibn-e-Majah)
40) Whoever innovates a good way in Islam, he will recieve the reward for it and the reward for those who act upon it, while the reward of those who do act upon it will not decrease. (Muslim, Nisaee, Ahmad Bin Hanmbal)