Some Bedouins came to the Prophet (may Allah's peace and blessings be upon him) and (during their visit) they asked him: "Do you kiss your children?" The Prophet (may Allah's peace and blessings be upon him) replied: 'Yes.' Bedouins are normally harsh and rigorous, so they said: "We never kiss our children." So the Prophet (may Allah's peace and blessings be upon him) said: If Allah has removed mercy from your hearts, I would not be able to put it in them.