Albert Barnes on 1 Peter 5:4

And when the chief Shepherd shall appear. The prince of the pastors--the Lord Jesus Christ. "Peter, in the passage above, ranks himself with the elders; here he ranks Christ himself with the pastors."--Benson. 1Pet 2:25. Comp. Heb 13:20.

Ye shall receive a crown of glory. A glorious crown or diadem. Comp. 2Ti 4:8.

That fadeth not away. This is essentially the same word, though somewhat different in form, which occurs in 1Pet 1:4. 1Pet 1:4. The word occurs nowhere else in the New Testament. Comp. 1Cor 9:25.

(e) "chief Shepherd" Heb 13:20 (f) "crown of glory" 2Ti 4:8