(10) باب الْكَلاَمِ فِي الأَذَانِ
Narrated `Abdullah bin Al-Harith:
Once on a rainy muddy day, Ibn `Abbas delivered a sermon in our presence and when the Mu'adhdhin pronounced the Adhan and said, "Haiyi `ala-s-sala(t) (come for the prayer)" Ibn `Abbas ordered him to say 'Pray at your homes.' The people began to look at each other (surprisingly). Ibn `Abbas said. "It was done by one who was much better than I (i.e. the Prophet (ﷺ) or his Mu'adh-dhin), and it is a license.'
Reference: Sahih al-Bukhari 616
In-book reference: Book 10, Hadith 14
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 11, Hadith 590