Reference: ad-Durr ath-Thameen fee Tarjamti Faqeehil-Ummah al-‘Allaamah ibn ‘Uthaymeen – Page 60
Concerning the Imaam, the Shaykh – Muhammad ibn Saalih al-‘Uthaymeen (rahima-hullaah), it has been narrated:
And Shaykh Muhammed, I mean Ibn ‘Uthaymeen rahima-hullaah, loved his Shaykh, ‘Abdul-‘Azeez ibn Baaz immensely. Once, I called him during the time when Shaykh ‘Abdul-‘Azeez was ill, and I spoke to him about this, and he said to me: May Allaah not permit us to witness the day he dies.
And when Shaykh ‘Abdul-‘Azeez died, I called Shaykh Muhammad the morning following his death and asked him: Has the news reached you? And he replied: Yes, [and] what a great man [he was].