Narrated 'Abdullah bin Abu Aufa (Radi-Allahu 'anhu):
A man displayed some goods in the market and swore by Allah that he had
been offered so much for that, that which was not offered, and he said so,
so as to cheat a Muslim. On that occasion the following Verse was revealed:
"Verily! Those who purchase a small gain at the cost of Allah's covenant
and their oaths (They shall have no portion in the Hereafter ..etc.)'
Hadrat Anas Radi ALLAH Taala Anhu reported that the Messenger of Allah Peace And Blessings Be Upon Him has said, “Everything has a heart, and the heart of the Qur’an is Yasin. Allah records anyone who recites Yasin as having recited the Qur’an ten times.”
[Sunan Tirmidhi, Vol 2, Page 116 - Sunan Daarimi, Vol 2, Page 336]