The Apostle Peter
1 Peter 1:4BSB·traditional attribution

and into an inheritance that is imperishable, undefiled, and unfading, reserved in heaven for you,

John Calvin Reformed @genevareformer

4 To an inheritance Pareus puts, “that is, to an inheritance,” making this sentence explanatory of “the hope,” as hope here is a metonymy for its object. It is an inheritance “incorruptible,” not to be destroyed by a flood or by fire, — “undefiled,” not like the land of Canaan, its type, which was defiled by its inhabitants, — “unfading,” different from any worldly inheritance, for the world passeth away.

Matthew Henry Presbyterian @wholebiblehenry

We come now to the body of the epistle, which begins with, I. A congratulation of the dignity and happiness of the state of these believers, brought in under the form of a thanksgiving to God. Other epistles begin in like manner, Co2 1:3; Eph 1:3. Here we have, 1. The duty performed, which is blessing God. A man blesses God by a just acknowledgment of his excellency and blessedness.

Commenting on 1 Peter 1:3-5

John Gill Reformed Baptist @doctorgill

To an inheritance incorruptible,.... This is a further explanation of the "lively hope", or hope laid up in heaven, which regenerate ones are begotten to: it is an "inheritance"; a large estate, and rich possession, they are born heirs apparent to; what is not to be got by industry, or obtained by the works of the law; for they that are of the law are...