It is reported from Nu3aym bin 7ammaad:
3abdullah bin Al-Mubaarak used to often stay at home, so he was asked, “Don’t you get lonely?” He replied, “How could I get lonely when I am with the Prophet – Allaah’s peace and blessings be upon him (i.e. I read his hadeeth)?”
Also on the authority of Nu3aym bin 7ammaad:
It was once said to 3abdullah bin Al-Mubaarak, “O Abu 3abd Al-Rahmaan, you often sit alone at home.” He said, “I am alone? I am with the Prophet - Allaah’s peace and blessings be upon him – and his Companions.” Meaning: reading hadeeth.
Ibn 3asaakir, Taareekh Dimashq 32/458.
Shaqeeq bin Ibraaheem reports:
It was once said to 3abdullah bin Al-Mubaarak, “After you have prayed with us you don’t sit with us?” He replied, “I go and sit with the Sa7aabah and the Taabi3een.” We said, “And how can you sit with the Sa7aabah and Taabi3een (when they have all passed away)?” He replied, “I go and read the knowledge I have collected, I find their narrations and deeds. What would I do with you? You sit around backbiting people.”
Adh-Dhahabee, Siyar A3laam Al-Nubalaa’ in his biography of 3abdullah bin Al-Mubaarak.