The passuk in Parshas Ki Sisa read, “Do not cook a kid in it’s mother’s milk.” The Torah tells us this passuk three separate times, one to teach us the prohibition of cooking milk and meat, one to prohibit eating milk and meat, and the third to prohibit deriving any benefit from the mixture. In addition to not eating them together, one cannot partake of them in the same meal, and must wait the six hours between meat and milk. There is another halachah that one must wait between eating hard cheese and meat. The exact definition of hard cheese is unclear and must be discussed with a Rav.
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Rabbi Aharon Dovid Singer
Rosh Kollel, North Miami Beach Community Kollel
Director, South Florida Torah Initiative