to an incorruptible and undefiled inheritance that doesn't fade away, reserved in heaven for you,
And undefiled ...  The old Israel's inheritance (Canaan) had been indeed defiled.  Again and again the people had fallen into idolatry; oppression of the poor was everywhere; even the sacred temple itself had not been exempt from the heel of the invader and the pollution of the most holy altar by the sacrifice of a sow.