Sahih al-bukhari:6176 Chapter: Al-Birr and As-Sila Book 78, Hadith 200

Narrated Ibn `Abbas: When the delegation of `Abdul Qais came to the Prophet, he said, “Welcome, O the delegation who
have come! Neither you will have disgrace, nor you will regret.” They said, “O Allah’s Messenger (ﷺ)! We
are a group from the tribe of Ar-Rabi`a, and between you and us there is the tribe of Mudar and we
cannot come to you except in the sacred months. So please order us to do something good (religious
deeds) so that we may enter Paradise by doing that, and also that we may order our people who are
behind us (whom we have left behind at home) to follow it.” He said, “Four and four:” offer prayers
perfectly , pay the Zakat, (obligatory charity), fast the month of Ramadan, and give one-fifth of the
war booty (in Allah’s cause), and do not drink in (containers called) Ad-Duba,’ Al-Hantam, An-Naqir
and Al-Muzaffat.”