That now are (νυν). "The now heavens" over against "the then world" (ο τοτε κοσμος verse 2. Peter 3:6).

By the same word (τω αυτω λογω). Instrumental case again referring to λογω in verse 2. Peter 3:6.

Have been stored up (τεθησαυρισμενο εισιν). Perfect passive indicative of θησαυριζω, for which verb see Matthew 6:19; Luke 12:21.

For fire (πυρ). Dative case of πυρ, not with fire (instrumental case). The destruction of the world by fire is here pictured as in Joel 2:30; Psalm 50:3.

Being reserved (τηρουμενο). Present passive participle of τηρεω, for which see 2. Peter 2:4.

Against (εις). Unto. As in 2. Peter 2:4; 2. Peter 2:9 and see 1. Peter 1:4 for the inheritance reserved for the saints of God.