Hazrat Mu‘aaz (radhiyallahu ‘anhu) mentioned:

I was once in Mina with Hazrat ‘Umar (radhiyallahu ‘anhu). On that occasion, he asked me, “Which person do you think that the people will be pleased to appoint as Khalifah after me?” I replied, “The people are most pleased with Hazrat ‘Uthmaan (radhiyallahu ‘anhu).”

(Siyar A’laam min Nubalaa 2/155)

When Hazrat ‘Uthmaan (radhiyallahu ‘anhu) was appointed as the Khalifah, Hazrat ‘Abdullah bin Mas’ood (radhiyallahu ‘anhu) remarked, “We appointed the best of the Sahaabah who remained after Hazrat Abu Bakr (radhiyallahu ‘anhu) and Hazrat ‘Umar (radhiyallahu ‘anhu), and we did not fall short in appointing the best person as Khalifah.”

(Siyar A’laam min Nubalaa 2/156)