The Prophet ﷺ said, "Whoever calls the adhan for twelve years, Paradise becomes guaranteed for him. For every adhan he is credited with sixty good deeds, and for every iqamah thirty good deeds."
أن النبي ﷺ قال: من أذن اثنتي عشرة سنة وجبت له الجنة، وكتب له بكل أذان ستون حسنة، وبكل إقامة ثلاثون حسنة.
Daraqutni (929) and Hakim (1/205) both narrated it through chains from Abdullah bin Wahb, who said, Ibn Lahia told me, from Ubaydullah bin Abu Jafar, from Nafi, from Ibn Umar, and he mentioned it. Its chain is hasan because of the narration of Abdullah bin Wahb from Ibn Lahia. Ibn Jurayj corroborated it from Nafi.Ibn Majah (728), Hakim (1/205), Bayhaqi (1/433), and Baghawi in Sharh al-Sunnah (2/282) all narrated it through the route of Abdullah bin Salih Misri, who said, Yahya bin Ayub told us, from Ibn Jurayj, in similar wording. There is some minor criticism of Abdullah bin Salih, though he is truthful as long as there is no objectionable content in his hadith. Hakim said, "This is a sahih hadith according to the criterion of Bukhari."However, Ibn Jurayj is a mudallis, and he practiced tadlis in this chain, as shown by what Bayhaqi narrated from Yahya bin Mutawakkil, from Ibn Jurayj, from someone who told him, from Nafi. Bukhari said, "This is more likely correct." So this chain is daif because of the unidentified narrator, but it is strengthened by the first chain, and Hakim treated it as a corroborating witness for it.