Hebrews 10:18

‘Now where remission of these is, there is no more offering for sin.'

And all this being so no further offerings for sin will be required. For once sins are remitted, removed and sent away, there is no more an offering for sin. All offerings for sin have become redundant.

The inference behind all this is that once Christ's work has been wrought in a man or woman the problem of their sin as a barrier or as a condemnation is dealt with for ever as far as God is concerned. It will nevermore be accounted to them. Thus no more sacrifices and offerings are required. What will be required of them is their obedience as children to their Father. And if that obedience fails there will be chastisement but never condemnation (Hebrews 12:5; Romans 8:1).

But the further inference is that now remission of all sins is available in Christ, there is nowhere else to turn in order to obtain remission of sins.