Early Friday morning this past week, as I was preparing the Gemara I would be teaching in shiur later that day, I recalled a question one of my students had asked me about a certain halachah regarding bris milah. I have a couple of s’farim about bris milah that are together on a shelf, and I reached for one of them. If I receive a sefer as a gift, or if I purchase it at a memorable place or a special occasion, I often will record that on the inside cover of the sefer. When I opened that particular sefer about bris milah, I found that I had written the following in Hebrew: “I purchased the sefer in honor of the birth of our twins on the sixth of Elul, Erev Shabbos Parshas Shoftim 5776, and, through the kindness of Hashem, we entered them into the bris of Avraham Avinu on time (the eighth day), Friday, the 13th of Elul.”