ASHARATU MUBASHSHARAH OR AL-ASHARATU MUBASHSHARUN BIL-JANNAHAsharatu Mubashsharah (Arabic: العشرة المبشّرون بالجنة or عشرة المبشّر) are the ten companions of Muhammad ﷺ who were given promised paradise during the time of Prophet Muhammad ﷺ.
MeaningThe 10 chaplets or necklaces were the 10 best companions of the Prophetﷺknown as Ashra-Mubbashshira (10 bestowed with good news). These were foretold in this world of their salvation in the hereafter i.e. they were given the good news of entering paradise by the Prophet’sﷺown lips and after naming each one he said “in Paradise”
Names of 10 best companions
Hadith
Rabah ibn al-Harith(R) said:I was sitting with someone in the mosque of Kufah while the people of Kufah were with him. Then Sa'id ibn Zayd ibn Amr ibn Nufayl came and he welcomed him, greeted him, and seated him near his foot on the throne. Then a man of the inhabitants of Kufah, called Qays ibn Alqamah, came. He received him and began to abuse him.
Sa'id asked: Whom is this man abusing? He replied: He is abusing Ali. He said: Don't I see that the companions of the Messenger of Allah (ﷺ) are being abused, but you neither stop it nor do anything about it? I heard the Messenger of Allah (ﷺ) say--and I need not say for him anything which he did not say, and then he would ask me tomorrow when I see him --AbuBakr will go to Paradise and Umar will go to Paradise. He then mentioned the rest of the tradition to the same effect (as in No. 4632).
He then said: The company of one of their man whose face has been covered with dust by the Messenger of Allah (ﷺ) is better than the actions of one of you for a whole life time even if he is granted the life-span of Noah. Classed as sahih by sheikh Albani in Sunan Abi Dawud 4650
See alsoSahaba or companions in Islam; Abu Bakr Siddique(R), Umar ibn Khattab(R), Uthman ibn Affaan(R); Ali ibn Abi Taalib; Aisha(R) ; Sa’d bin Abi Waqqas(R); Abu Hurairah(R);
Referenceshttp://islamic-dictionary.tumblr.com/post/3932678213/al-asharatu-mubashsharun-bil-jannah-or |
Abu Bakr Siddique 
Narrated Sa'id ibn Zayd(R):AbdurRahman ibn al-Akhnas said that when he was in the mosque, a man mentioned Ali (may Allah be pleased with him). So Sa'id ibn Zayd got up and said: I bear witness to the Messenger of Allah (.