The Apostle Paul
1 Thessalonians 4:13BSB·traditional attribution

Brothers, we do not want you to be uninformed about those who sleep in death, so that you will not grieve like the rest, who are without hope.

John Calvin Reformed @genevareformer

13 But I would not have you ignorant. It is not likely that the hope of a resurrection had been torn up among the Thessalonians by profane men, as had taken place at Corinth. For we see how he chastises the Corinthians with severity, but here he speaks of it as a thing that was not doubtful.

Matthew Henry Presbyterian @wholebiblehenry

In these words the apostle comforts the Thessalonians who mourned for the death of their relations and friends that died in the Lord. His design is to dissuade them from excessive grief, or inordinate sorrow, on that account. All grief for the death of friends is far from being unlawful; we may weep at least for ourselves if we do not weep for them, weep...

Commenting on 1 Thessalonians 4:13-18

John Gill Reformed Baptist @doctorgill

But I would not have you to be ignorant, brethren,.... As they seem to have been, about the state of the pious dead, the rule and measure of mourning for them, the doctrine of the resurrection of the dead, the second coming of Christ, and the future happiness of the saints; wherefore the apostle judged it necessary to write to them upon these subjects: the...