(Imām Bukhārī narrates): Abū Nu'aim narrated to us, he said: Hishām narrated to us, from Yahyā ibn Abī Kathīr, from 'Abdullāh ibn Abī Qatādah, from his father, that:
the Prophet ﷺ used to lengthen the first rak'ah of Zuhr and shorten the second rak'ah, and he used to do this in the Fajr prayer.
Reference: Sahih Al Bukhari 779