Leaven in Scripture is what is generally called “yeast” in this country. When it is put into dough, it works all through it.
“Purge out therefore the old leaven, that ye may be a new lump as ye are unleavened.”
That is, sin had been practiced by one, and they had to put that person away from among them as being leaven, or they all would be marked with the same sin.
So it is, dear children, if we keep company with those who are evil—those who have bad ways—we become just like them. We may seek to do good to all, and seek to point to those who are going on in sin the awful result of it, and also to point them to Jesus is the Saviour for poor sinners. But if we keep company with them, we will soon be like them and do as they do, for the Scripture again says,
May this little lesson in connection with the leaven he of blessing to all who believe on the Lord Jesus Christ.
ML 06/25/1939