It wasnarrated from Abu Sa'eed that the Messenger of Allah (ﷺ) sawthatsome of his Companions tended to stand in the rear, so he said:
"Comeforward and follow me, and let those who are behind you followyourlead. If people continue to lag behind, Allah will put themback." (JA)
English reference (JA): Vol. 1, Book 5, Hadith 978 (JA)
Arabic reference (JA): Book 5, Hadith 1031 (JA)