وَقَالَ النَّبِيُّ صلى الله عليه وسلم: إِنَّمَا جُعِلَ الإِذْنُ مِنْ أَجْلِ الْبَصَرِ.
The Prophet, may Allah bless him and grant him peace, said, "The ear is put in the place of the eye."
Reported by Al-Bukhari (No. 5924, 6241, 6901), Muslim (No. 2156a, 2156b, 2156c), At-Tirmidhi (No. 2709), An-Nasa’i (No. 4859), Ahmad (No. 21737) and Ad-Darimi (No. 2278). Cited in Al-Adab al-Mufrad (No. 1071).