Musannaf Ibn Abi Shayba 33:111

Yahya ibn Yaman narrated to us, from Ash'ath, from Ja'far, from Sa'id ibn Jubayr, who attributed it to the Prophet (may Allah bless him and grant him peace): "Indeed, the allies of Allah—no fear will there be concerning them, nor will they grieve." They are those who are remembered of Allah by their being seen.