Reb Yerucham: Bo: Sanctifying
The 2nd of Shevat is the Yahrtzeit of Rav Yisrael Chaim Kaplan, talmid at Mir, son-in-law of Rav Yerucham Levovitz, mashgiach at Beth Medrash Elyon in Monsey from mid-1940s until his petira (1970).
“Sanctify the first born, issue of the womb.” (13:2) It is already holy. We are commanded to sanctify the first born with our mouths, which teaches us, that we receive reward for what we say and how we say it. (Da’at Torah – Bo – Beiurim, Page 110)