1 Petrus 1:25

1:25 but the word of the Lord ¹  endures forever. ² 

And this is the word that was proclaimed to you.

1 Petrus 5:5

5:5 In the same way, you who are younger, ³  be subject to the elders. And all of you, clothe yourselves with humility toward one another, because God opposes the proud but gives grace to the humble. ⁴ 

[1:25]  ¹ sn The word of the Lord is a technical expression in OT literature, often referring to a divine prophetic utterance (e.g., Gen 15:1, Isa 1:10, Jonah 1:1). In the NT it occurs 15 times: 3 times as ῥῆμα τοῦ κυρίου (rJhma tou kuriou; here and in Luke 22:61, Acts 11:16) and 12 times as λόγος τοῦ κυρίου (logo" tou kuriou; Acts 8:25; 13:44, 48, 49; 15:35, 36; 16:32; 19:10, 20; 1 Thess 1:8, 4:15; 2 Thess 3:1). As in the OT, this phrase focuses on the prophetic nature and divine origin of what has been said.

[1:25]  ² sn A quotation from Isa 40:6, 8.

[5:5]  ³ sn In this context younger and elder are terms that combine two meanings: relative age and an official structure of leadership in the church. As in v. 1, elder here denotes those who exercise spiritual leadership, who for the most part are older in years. Likewise younger means the rest of the community, who for the most part are younger in age, who are urged to accept the authority of their leaders.

[5:5]  ⁴ sn A quotation from Prov 3:34 (cf. Jas 4:6).