We might have known the names and roles of the 10 leading angels which are commonly mentioned. Besides this there are a lots of hadith and Quran ayats mentioning about angels and the 8 interesting facts that I came across as follows:
1. Believing In Angels IS A MUST.
Quran, sura 2 (Al-Baqrah) ayat 97-98
“Whoever is an enemy to Allah and His angels and messengers, to Jibreel and Mikaaeel ,- Lo! Allah is an enemy to those who reject Faith.”
2. When Angels say Amin at the end of prayer , Sins are forgiven.
The Prophet (s.a.w) said, “Angels keep on descending from and ascending to the heaven in turn, some at night and some by daytime, and all of them assemble together at the time of the Fajr and ‘Asr prayers. Then those who have stayed with you overnight, ascend unto Allah Who asks them (and He knows the answer better than they): “How have you left My slaves?” They reply, “We left them while they were praying and we came to them while they were praying.” The narrator added: “If anyone of you says ‘Amin (during the prayer at the end of the recitation of Surat Al-Fatiha), and the angels in heaven say the same, and the two sayings coincide, all his past sins will be forgiven.” -Hadith – Bukhari, Vol. 4, Hadith No. 446, Narrated Abu Huraira ( r.a.)
3. Angels With Wings
Narrated Jabir bin ‘Abdullah : When my father was martyred, I lifted the sheet from his face and wept and the people forbade me to do so but the Prophet did not forbid me. Then my aunt Fatima began weeping and the Prophet said, “It is all the same whether you weep or not. The angelswere shading him continuously with their wings till you shifted him (from the field). ” – Sahih Bukhari -Book 23, Hadith 336
4. It happens everyday….
Narrated Abu Huraira : The Prophet said, “Every day two angels come down from Heaven and one of them says, ‘O Allah! Compensate every person who spends in Your Cause,’ and the other (angel) says, ‘O Allah! Destroy every miser.’ ” – Sahih Bukhari – Book 24, Hadith 522
5. Two angels guarding Medina on The Last Day.
Narrated Abu Bakra: The Prophet said, “The terror caused by Al-Masih Ad-Dajjal will not enter Medina and at that time Medina will have seven gates and there will be two angelsat each gate guarding them.” – Sahih Bukhari – Book 30, Hadith 103
6. Angel’s presence at Friday Prayers.
Narrated Abu Huraira: The Prophet said, “On every Friday the angels take heir stand at every gate of the mosques to write the names of the people chronologically (i.e. according to the time of their arrival for the Friday prayer and when the Imam sits (on the pulpit) they fold up their scrolls and get ready to listen to the sermon.” - Sahih Bukhari – Book 54, Hadith 433
7. Angels do not enter house with pictures of living things.
Narrated ‘Aisha: I stuffed for the Prophet a pillow decorated with pictures (of animals) which looked like a Namruqa (i.e. a small cushion). He came and stood among the people with excitement apparent on his face. I said, “O Allah’s Apostle! What is wrong?” He said, “What is this pillow?” I said, “I have prepared this pillow for you, so that you may recline on it.” He said, “Don’t you know that angels do not enter a house wherein there are pictures; and whoever makes a picture will be punished on the Day of Resurrection and will be asked to give life to (what he has created)?” - Sahih Bukhari – Book 54, Hadith 447
8. How soothsayers know a bit of truth..
Narrated ‘Aisha: The Prophet said, “While the angels talk amidst the clouds about things that are going to happen on earth, the devils hear a word of what they say and pour it in the ears of a soothsayer as one pours something in a bottle, and they add one hundred lies to that (one word).” – Sahih Bukhari – Book 54, Hadith 508