Allah's Messenger said: "Whoever says, when he hears the call: (Allahumma, rabba hadhihidda 'watit-tammati was Salatilqa'imah, ati Muhammadanil wasilata wal-Fadilata, wab'athhu Maqamun Mahmudan alladhi wa'adtahu) 'O Allah! Lord of this perfect call and established prayer, grant Muhammad Al-Wasilah and Al-Fadilah, and raise him to the praised station that you promised him' - then intercession on the Day of Resurrection is made lawful for him."
Reference: Jami` at-Tirmidhi 211 In-book : Book 2, Hadith 63 English translation : Vol. 1, Book 2, Hadith 211
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