John Gill Commentary Hebrews 10:34

"For ye both had compassion on them that were in bonds, and took joyfully the spoiling of you possessions, knowing that ye have for yourselves a better possession and an abiding one." — Hebrews 10:34 (ASV)

For you had compassion of me in my bonds
When he was bound at Jerusalem, by the chief captain Lysias, with two chains, (Acts 21:33) or when he was in bonds elsewhere; which they did by sympathizing with him in their hearts; by their prayers for him, and in their letters to him; and by sending presents to him for his relief and support.

The Alexandrian copy, and two of Stephens', the Vulgate Latin and Syriac versions, read, "had compassion on the prisoners"; or "those who were bound"; meaning prisoners in general, remembering them that were in bonds, as bound with them; or particularly such as were prisoners for the sake of Christ, and his Gospel; and it may be some of them, which the apostle himself committed to prison, in his state of unregeneracy:

and took joyfully the spoiling of your goods ;
the furniture of their houses, their worldly substance, from which they were stripped by their persecutors; and this they took quietly and patiently, yea, joyfully; rejoicing that they were counted worthy to suffer the confiscation of their goods for the sake of Christ: the reason of which joy was,

knowing in yourselves that you have in heaven a better and an
enduring substance :
that which is laid up for the saints in heaven is "substance"; it is signified by an house, a city, a kingdom; and so it is rendered here in the Ethiopic version; and by riches, true, glorious, and durable; and by a treasure and an inheritance: and this is "better" than anything in this world; as to the quality of it, it being celestial; and as to the quantity of it, it being all things; and as to the place where it is, "in heaven"; though this clause is left out in the Alexandrian copy, and in the Vulgate Latin and Ethiopic versions; and as to the company with whom it is enjoyed, saints in light;

yea, God himself is the portion of his people: and this is an "enduring" substance; it cannot be wasted by the saints themselves; nor taken away from them by others; nor can it decay in its own nature; and the saints will always endure to enjoy it: and this they may be said to "have": it is promised to them, and prepared for them; they have a right unto it, and the earnest of it; and they have it already in Christ, their head and representative; so that it is, upon all accounts, sure unto them:

and this they know in themselves; from what they find and feel in their own hearts; from the sealing testimony and earnest of the Spirit, and from the promise of Christ, (Matthew 5:10) .