[16].Surah An-Nahl [The Bees] : Ayat 36

Ayat 36. And verily, We have sent among every Ummah (community, nation) a Messenger (proclaiming): "Worship Allah (Alone), and avoid (or keep away from) Tâghût (all false deities, etc. i.e. do not worship Tâghût besides Allah)." Then of them were some whom Allah guided and of them were some upon whom the straying was justified. So travel through the land and see what was the end of those who denied (the truth). 

Hazrat Abu Sufyan (May Allah be pleased with him) reported, in course of his detailed narration about Heraclius when the latter questioned him about the teachings of the Prophet  [SAWW](PBUH) He said that: He  [SAWW](PBUH) told (us): "Worship Allah Alone and do not associate a thing with Him; and give up all that your ancestors said. "He  [SAWW](PBUH)also commands us to perform Salat (prayers), to speak the truth, to observe modesty and to strengthen the ties of kinship.  [Al-Bukhari and Muslim]. [Al-Bukhari 01, Chapter 01, Hadith # 06]. 

Lesson : as mentioned above in Surah An-Nahl Ayat 36.Then of them were some whom Allah guided and of them were some upon whom the straying was justified. In this Hadith an enemy of the Prophet  [SAWW](PBUH) acknowledges the veracity of the Prophet's teaching, because Abu Sufyan (May Allah be pleased with him) made this admission when he was a pagan. This Hadith is mentioned in detail in Sahih Al-Bukhari.