This Surah is ‘makki’ and it has 109 verses. It is narrated from Imam Ja’far as-Sadiq (a.s.) that if a person recites this Surah once in two or three months, he will not be placed alongside the ignorant ones and will be from among the ‘muqarrabeen’ (close ones) on the Day of Reckoning. It is also narrated that if a person recites Surah Yunus, he will get the reward equal to the number of people who were present in the community of Prophet Yunus (a.s.).
This Surah can be used as a means of identifying thieves from among your workers. This is done by either writing the Surah and under it writing the names of all the people in the house or workplace who could be suspected of stealing and then keeping this writing in the house. It will, after some time, become manifest who the thief is. Al-islam.org