In 1967, when the Six-Day War broke out, Teshima wrote a telegram to the Makuya students in Israel: "Stay as long as you can and help Israel."
Teshima's name was inscribed twice on the Golden Book of the Jewish National Fund; once in September, 1967 in honor of his staunch support for Israel during the Six-Day War and once in January, 1974 honoring his passing.