al-Khateeb al-Bhagdaadi 463 AH narrates that some of the salaf said,

لا ينال هذا العلم الا من عطل داكانه, و خرب بستانه, و هجر اخوانه, و مات أقرب أهله فلم يشهد جنازته

“No one will attain this knowledge except one who shuts down his store, destroys his garden, abandons his brothers, and (when) his closest of relatives dies he does not witness the janaazah.”

Collected in “al-Jaami'” 2/252