(Another chain) from Ibrahim, from Al-Aswad, with similar narration.
Sunan an-Nasa'i Book 7, Hadith 26
← Previous Hadith "The final words of the Adhan of Bilal were: 'Allahu Akbar, Allahu Akbar, Allahu Akbar; La ilaha illallah (Allah is the Greatest, Allah is the Greatest, there is none worthy of worship except Allah.)'"

Sunan an-Nasa'i Book 7, Hadith 25 Next Hadith → "Al-Aswad bin Yazid narrated to me from Abu Mahdhurah that the final words of the Adhan are: 'La ilaha illahha (there is none worthy of worship except Allah).'"

Sunan an-Nasa'i Book 7, Hadith 27