It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) said: "Whoever, on hearing the adhan, says: 'Allahumma inni as'aluka bi-haqqi hadhihi al-da'wati al-tammati wa al-salati al-qa'imah, ati Muhammadan al-wasilata wa al-fadilah, wab'athhu al-maqam al-mahmud alladhi wa'adtahu, innaka la tukhlifu al-mi'ad' (O Allah, I ask You by the right of this perfect call and the prayer about to be established: grant Muhammad (peace and blessings be upon him) al-Wasilah and excellence, and raise him to the Praised Station that You have promised him; indeed You do not break Your promise), my intercession becomes due for him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 1933