I believe we have an obligation to share the Good News with everyone. The result is not in our hands. I had not considered it as OP put it ..but that seems correct..The order of God was that the gospel should be preached to everyone..and there will be a cost if we are not obedient in that ~~ I agree with that. But that is not my point. Nor was it O.P.'s. And I still can't find his scripture quote anywhere.I am afraid I have to disagree with RnMomof7's phrasing also. There will not necessarily be a "cost" to the Weak Preacher in the Eternal sense, for the Sin of having failed to Preach is equally covered by the blood of Christ as any other sin. Hence, the blood of the Reprobate be on our heads if we fail to preach, but even our offense in that is covered by the Blood of Jesus.
Nonetheless, it is an Offense in the first place.
When I say unto the wicked, Thou shalt surely die; and thou givest him not warning, nor speakest to warn the wicked from his wicked way, to save his life; the same wicked man shall die in his iniquity; but his blood will I require at thine hand.Yet if thou warn the wicked, and he turn not from his wickedness, nor from his wicked way, he shall die in his iniquity; but thou hast delivered thy soul. (Ezekiel 3: 18-19)