Maalik Ibn Deenaar (rahimahullaah) said, ”The people (i.e. some of them) exit the worldly life without tasting the most tasteful thing in it”; so they (i.e. the people) asked, ‘What is it O father of Yahya?’ He said, ”Knowledge and awareness of Allaah”.
[Source: Maktabah Shaamilah- Seeratus Salaf As-Saaleh’ by Imaam Ismaaeel Bin Muhammad Bin Fadl Al-Asbahaanee (535AH: Chapter: A mention of those who followed the companions in righteousness]
Knowledge and Awareness of Allaah: knowledge and awareness that makes the person accept whatever He (Allaah) has prescribed and laid down, and causes him to submit to that, and to judge by the Prescribed laws which the Messenger (sallal-laahu-alayhi-wasallam) came with…..[For further details see: Translation of the Explanation of the three fundamental principles page 38 – By Ustaadh Abu Talhah Daawud Burbank (may Allaah have mercy on him and his wife. Aameen]