The words of dua adhan and their meanings
Whoever invokes blessings on the Prophet and recites the following prayer formula upon hearing the al-Adhan, the Prophet’s intercession becomes guaranteed for him on the Day of Judgment
اللَّهُمَّ رَبَّ هَذِهِ الدَّعْوَةِ التَّامَّةِ وَالصَّلَاةِ الْقَائِمَةِ آتِ مُحَمَّداً الْوَسِيلَةَ وَالْفَضِيلَةَ وَالدَّرَجَةَ الرَّافِعَةَ وَابْعَثْهُ مَقَاماً مَحْمُوداً الَّذِي وَعَدْتَهُ إَنَّكَ لَا تُخْلِفُ الْمِيعَادَ
“O Allah! The Lord of this perfect call and of this prayer about to be performed, grant our liegelord Muhammad the favor of nearness unto You and excellence. And elevate him to the high position (al-Maqam al-Mahmud) that You have promised him. Without any doubt You never break Your promise.”
(Bukhari, al-Adhan 8)