Who can pray at the first queue?

It is said that Prophet Muhammad peace be upon him and his household declared some specialties or actually terms for the persons who intend to say their prayers (Salah/Namaz) at the first queue of Jama'a prayer. In the meanwhile, as a related hadith, I’ve heard a tradition (hadith) from Imam Muhammad-al-Baqir (a.s.) (الامام محمدالباقر علیه السلام) as the fifth Imam of Shia who said: > the learned and good-tempered persons stand at the first queue … I’m looking for relevant hadiths (traditions) concerning that. In other word I was wondering if there should be any special conditions or qualifications for the individuals who intend to say their prayers by standing at the first queue in Salah-al-Jama’ah? *Note: I'd be appreciated if you respond it by referring to hadiths or scholars' rulings.*