Reference: Siyar A’laam an-Nubalaa – Volume 8, Page 373
Abu ‘Abdir-Rahmaan ‘Abdullaah al-’Umaree would visit the graveyard a lot, and with him he would have a book to read. [About this], he would say:
There is nothing more of an exhortation [to good] than the grave, and nothing more of a companion than a book, and nothing more safer than unity.
