Charles Spurgeon Commentary 1 Samuel 2:34-35

"And this shall be the sign unto thee, that shall come upon thy two sons, on Hophni and Phinehas: in one day they shall die both of them. And I will raise me up a faithful priest, that shall do according to that which is in my heart and in my mind: and I will build him a sure house; and he shall walk before mine anointed for ever." — 1 Samuel 2:34-35 (ASV)

And this shall be a sign unto thee, that shall come upon thy two sons, on Hophni and Phinehas; in one day they shall die both of them. And I will raise me up a faithful priest, that shall do according to that which is in mine heart and in my mind: and I will build him a sure house; and he shall walk before mine anointed for ever.

No doubt first referring to Zadok, who succeeded afterwards to the priest's office; but looking further forward still to our Lord Jesus Christ, who is the ever-faithful High Priest who always does according to that which is in the mind and heart of the Father.