[13].Surah Ar-Ra'd [The Thunder]: Ayat 36

Ayat 36. (O Muhammad [SAWW](PBUH) Those to whom We have given the Book (such as 'Abdullah bin Salam (May Allah be pleased with him) and other Jews who embraced Islam), rejoice at what has been revealed unto you (i.e. the Qur'an), but there are among the Confederates (from the Jews and pagans) those who reject a part thereof. Say (O Muhammad [SAWW](PBUH) "I am commanded only to worship Allah (Alone) and not to join partners with Him. To Him (Alone) I call and to Him is my return." 

Hazrat Aamir bin Sad bin Abi Waqqas narrated from his father Sad bin Abi Waqqas (May Allah be pleased with him) reported & said, I have never heard the The Messenger of Allah  [SAWW](PBUH) saying about anybody walking on the earth that he is from the people of Paradise except Hazrat Abdullah bin Salam (May Allah be pleased with him). The following Verse was revealed in Surah Al-Ahqaf (Ayat 10) concerning him: " Say: "Tell me! If this (Qur'an) is from Allah, and you deny it, and a witness from among the Children of Israel ('Abdullah bin Salam ) testifies that this Qur'an is from Allah [like the Taurat (Torah)], so he believed (embraced Islam) while you are too proud (to believe)." Verily! Allah guides not the people who are Zalimun (polytheists, disbelievers and wrong-doing). (46.10) [Al-Bukhari Book 05, Chapter 58, Hadith # 157]. 

Lesson : as mentioned above in Surah Ar-Ra'd Ayat 36. "to whom We have given the Book (such as 'Abdullah bin Salam (May Allah be pleased with him) and other Jews who embraced Islam), rejoice at what has been revealed unto you (i.e. the Qur'an)," This Hadith also highlights the merits of Ahlul-Kitab means the people of the Scriptures, that is the Jews and the Christians. This Hadith has an inducement for them that if they embrace Islam, they will be entitled to a reward.