If someone passes away in a regular Shana Peshuta according to minhag Chabad what Adar do we observe in a leap year?
Adar Rishon. But if possible should daven and say Kaddish Adar Sheni too.
Sources:
See Rama 568: 7. Kitzur SA 221:3. See also Likkutei Sichos 16 p. 342 fn. 5.
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