One Saturday night several years ago, Rabbi Shlomo Carlebach, z"l, came out of his shul on New York's Upper West Side and was approached by a black man, asking for a donation.
"I'm so sorry, brother," Reb Shlomo said to the man. "My Sabbath just ended and I don't carry money on the Sabbath. It seems that I can't help you tonight."
"You already helped me," replied the man to Reb Shlomo. "You called me brother."