JMNT(i)
7 Yet if we keep on walking about (= continue living our life)
within the midst of and in union with the Light, as He exists (or: is)
within the Light, we constantly have common being and existence (or: hold common fellowship, participation and enjoy partnership)
with one another, and the blood of Jesus, His Son, keeps continually and repeatedly cleansing us (or: is progressively rendering us pure)
from every sin (or: from all error, failure, deviation, mistake, and from every [successive] shot that is off target [when it occurs]).
8 If we should up and say that we have no error (or: do not periodically possess deviation or hold sin and mistake),
we are continuously leading ourselves astray (or: deceiving ourselves and driving ourselves off the Path),
and the Truth is not (or: reality does not exist)
within us.
9 If it would be our habit to confess (admit; avow; say the same thing as; speak in accordance with; or: would continue in agreement [about])
our error (our failure; our sin; our mistake),
He is constantly faithful and just (fair; in accord with the Way pointed out and in right relationship; rightwised),
to the end that He would at once send away for us (or: dismiss or pardon and cause to flow away in us)
the errors ([some MSS add: our] failures, mistakes and deviations)
and then would cleanse [other MSS: He will cleanse]
us from all injustice (all that is contrary to the Way pointed out; every unrighteousness; all unfairness, inequity and unrighteous relationships; every behavior that is turned in the wrong direction).