ציטירנדיקער פּירוש אויף שופטים 8:2

ולאם מלאם יאמץ, they will never be evenly matched in strength, one of them always being stronger or weaker than the other. (Megillah 6) The letter ל in the word לאם is “weak,” spelled without the dagesh it ought to have. There are numerous such anomalies in Scripture, as for instance Judges 8,2 מבציר אביעזר, where the letter ב in the word mivtzir is unaccountably written without the dagesh. A similar anomaly exists in Ezekiel 32,30 מגבורים בושים, where the letter ג in the word מגבורים should have had a dagesh in it. There are other examples of this phenomenon.