Musannaf Ibn Abi Shayba 33:1353

Ishaq ibn Mansur narrated to us, he said: Abu Kudaynah narrated to us, from Mutarrif, from al-Minhal ibn ‘Amr, from Sa‘id ibn Jubayr, who said: When Ibn ‘Umar was struck [by his final illness], he said: "I have not left behind me anything of the world that I regret, except for the thirst of the midday heat and walking to the prayer."