The Messenger of Allah, (saw) said: "The parable of a good friend and a bad friend is that of a carrier of musk and a blacksmith. The carrier of musk will give you some, or you will buy some, or you will notice a good smell; but as for the blacksmith, he will burn your clothes or you will notice a bad smell." [Sahih Muslim, Book of Righteousness, Hadith #6692]
The above hadith meant that if we are in the company of good people or friends , we'll tend to follow his/her good character and are influenced by their good habits. They're able to give wise and good advises to us , and lead us to the right path. Hang out with the righteous people and you'll benefit from it
If you're hanging out with the good companion , it is equivalent to being friends with a perfume seller, you'll smell good, pleasant and naturally feel good. The righteous person will bound to influence you to do deeds and Insya'Allah you'll benefit from it.
Dear brothers and sisters , do choose your companions/friend carefully as he/she might influence you towards the good or the bad. Bad companions might tarnish your reputation or worst, changed you. May Allah (swt) save us and all the believers from fall into the Hellfire Insya'Allah.
Sourse:(Al-Fitwah.blogs.com)