وَلَقَدْ عَلِمْنَا ٱلْمُسْتَقْدِمِينَ مِنكُمْ وَلَقَدْ عَلِمْنَا ٱلْمُسْتَـْٔخِرِينَ Qur’an Al-Hijr (15:24)Walaqad AAalimn a almustaqdimeena minkum walaqad AAalimn a almustakhireen a
Or: "those of you who hasten forward [towards Us], and those who lag behind". Both these interpretations are considered equally legitimate by the early commentators.
Meaning may be: "those who preceded you in point of time and those who come after you in point of time; they are all known to Allah, and He will gather them all together on the Day of Judgment."