Ibn Abi al-Dunyaa relates:

When death approached Hudhayfah bin al-Yamaan (radiallaahu anhu), he displayed severe anguish (worry, fear), so it was said to him, "What has you made you cry (like this)?" He said, "I do not cry out of regret for (missing out on) the world, rather, death is more beloved to me, but I do not know whether I am proceeding on towards [Allaah's] pleasure or [His] anger."

In Mawsoo'ah Ibn Abi al-Dunyaa (5/343) through Hayat al-Salaf of Ahmad al-Tayyar.
Translated by Abu Iyaad (@abuiyaadsp)