اللَّهُ لاَ إِلَـهَ إِلاَّ هُوَ رَبُّ الْعَرْشِ الْعَظِيمِ
(Allah, La ilaha illa Huwa, the Lord of the Supreme Throne!) means, He is the One to be called upon, Allah, He is the One other than Whom there is no god, the Lord of the Supreme Throne, and there is none greater than Him in all of creation. Since the hoopoe was calling to what is good, and for people to worship and prostrate to Allah alone, it would have been forbidden to kill him. Imam Ahmad, Abu Dawud and Ibn Majah recorded that Abu Hurayrah, may Allah be pleased with him, said that the Prophet forbade killing four kinds of animals: ants, bees, hoopoes and the sparrow hawks. Its chain of narration is Sahih.