Is the husband religiously obligated to return 350 grams of gold to his wife, which she gave him to help him, knowing that she gave it to him with the intention of retrieval?

If gold is the wife's property and she lends it to her husband, then the husband is obliged to return an equivalent amount if it has an equivalent, or its value if it does not.

The Permanent Committee was asked about a man who sold his wife's gold, and she is now requesting it back. Should he buy it by the gram despite its high price, or should he give her its value in cash? The Committee replied: The obligation is to return the gold that was taken from her because it was a loan, so he must return what he took from her.