Sayyiduna Umar (may Allah be pleased with him) once, while traveling, delivered a sermon at "Jabiyah" and said that once the Prophet (peace and blessings be upon him) stood to deliver a sermon just as I am standing, and said: I advise you to treat my companions well, and this command is also for those who come after them, and for those who come after them as well. After that, there will come a people who will be ready to swear an oath before being asked to do so, and a man will be ready to give testimony before being asked for it. So whoever among you desires a place in Paradise should adhere to the "Jama'ah" (the main body), for the devil is with the lone person and is farther from two. Beware! None of you should sit in seclusion with a woman, for the third among them is the devil. And whoever is pleased by his good deed and saddened by his bad deed, he is a believer.