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!