'Once for All' in the Bible

For by the death He died He once for all ended His relation to sin, and by the life He now is living He lives in unbroken relation to God.

and you must stop offering to sin the parts of your bodies as instruments for wrongdoing, but you must once for all offer yourselves to God as persons raised from the dead to live on perpetually, and once for all offer the parts of your bodies to God as instruments for right-doing.

I am speaking in familiar human terms because of the frailty of your nature. For just as you formerly offered the parts of your bodies in slavery to impurity and to ever increasing lawlessness, so now you must once for all offer them in slavery to right-doing, which leads to consecration.