The Messenger of Allah ﷺ said, "The mufarridun have gone ahead."The companions asked, "Who are the mufarridun, Messenger of Allah?"He answered, "Those who are devoted to the remembrance of Allah. The remembrance lifts their burdens from them, so they come on the Day of Resurrection light of load."
حدثنا أبو كريب محمد بن العلاء أخبرنا أبو معاوية عن عمر بن راشد عن يحيى بن أبي كثير عن أبي سلمة
قال رسول الله ﷺ سبق المفردون قالوا وما المفردون يا رسول الله قال المستهترون في ذكر الله يضع الذكر عنهم أثقالهم فيأتون يوم القيامة خفافا
Sourcing, its chain is daif. Bayhaqi narrated it in Shuab al-Iman, 12/390, hadith: 506, 507, through Umar bin Rashid, and he is daif. The hadith is sahih by way of corroborating evidence, except for his saying "He lightens the burden of remembrance," see Sahih Muslim, hadith: 2676, and others.