Rabban Yochanan ben Zakai says: it is said (Devarim 27:6) "Of whole (shleimoth) stones shall you build the altar of the L–rd"—stones which repose peace ("shalom"). Now does this not follow a fortiori, viz.: If the stones of the altar, which do not see or hear or speak—because they repose peace between Israel and their Father in heaven, the Holy One Blessed be He says: Do not lift iron upon them, then one who reposes peace between a man and his wife, between one city and another, between one nation and another, between one government and another, between one family and another—how much more so will he not meet with adversity!