I know one nabi (saw) curses a person who speak lies just to make a person laugh he also said that: "when a person speaks lies,the angel's go one mile away from him because of the bad smell that comes from him."
Yes, why not. 1)This is related to the life and sayings of the Prophet (pbuh). A Muslim should hold fast to the sunnah and live his life according to the commands of Allah (swt),
Yea sure. Here are some hadith (sayings of prophet muhammad) dealing with Speaking Truth. ====== Bayhaqi from Jabir (Allah be pleased with him) from the Messenger of Allah (Allah bless him and give him peace) with the words, "There is no charity more beloved to Allah from speaking the truth." This was declared rigorously authentic by Ibn Hibban. Remembering Allah - Dhikr Narrated Abu Huraira: The Prophet said, "There are two expressions which are very easy for the tongue to say, but they are very heavy in the balance and are very dear to The Beneficent (Allah), and they are, 'Subhan Allah Al-'Azim and 'Subhan Allah wa bihamdihi.'" (Bukhari Book 75, Hadith 415) Any time you have a moment, remember Allah (Subhanahu wa ta'ala) Social Obligation on Speaking Out Against Oppression, Evil, and Injustice Prophet (peace and blessings of Allah be upon him), "Whoever among you sees an evil action, let him change it with his hand [by taking action]; if he cannot, then with his tongue [by speaking out]; and if he cannot, then with his heart [by hating it and feeling that it is wrong] – and that is the weakest of faith" (Narrated by Muslim, 49)
