Henkin considered
Reform marriage as a form of common law marriage requiring a Jewish divorce (
get). He was opposed to the practice in
yeshivas and
synagogues of pausing in the middle of the
Rosh Hashanah services for
kiddush and refreshments before
shofar-blowing. (His stance is defended in his grandson's responsa.) If a Jewish storekeeper completed a form to sell his
chametz to a non-Jew before
Passover, yet he kept his store open, selling
chametz on
Passover and keeping the profits for himself, Henkin said that this proved the "Chametz sale" to be a fraud and therefore invalid. (Rabbi
Moshe Feinstein, on the other hand, said the sale was still valid.) Henkin said that where tuna have been caught it is permissible to check only a few of each batch and not each individual fish; Feinstein said that each fish needed to be checked for kosher markings that it was in fact a tuna, and not some other fish.
Manhattan eruv In 1936, Henkin said that Rabbi Yehoshua Seigel's 1905 Manhattan
eruv could no longer be relied on because he had only acquired permission for ten years. Henkin's main argument why the eruv could no longer be relied on was because of the construction of bridges that crossed Manhattan’s waterfront. On March 15, 1960, he signed on a Statement of the Vaad L’Maan Tikkun Eruvin B’Manhattan that stated the need for a Manhattan eruv. On July 12, 1961, Henkin wrote a letter saying that there was a sound basis to establish an eruv in Manhattan. He wrote that, until the eruv received the written support of most of the rabbis of Manhattan, the permission for the eruv would only be for times of great need. ==Position on Israel==