R. Willowski, due to what he considered to be the neglect of religious life in America, emigrated to Erez Israel in 1905, settling in Safed, where he founded yeshivah Torat Erez Israel, known as Yeshivat ha-Ridbaz. He took issue with R. Abraham Isaac Kook, then rabbi of Jaffa, for his lenient ruling permitting farmers to work the land during the Sabbatical Year. In the Sabbatical Year of 1910, R. Willowski urged them not to work the land, and established an international charity fund to sustain those who followed his decision. His was particularly renowned for his two commentaries to the Jerusalem Talmud, one of which followed the method of Rashi, the other tosafot. His other works are Migdal David (1874) and Hanah David (1876), both containing novellae and comments on the Babylonian and Jerusalem Talmuds; Responsa (1881); Responsa Beit Ridbaz (1908); and annotations on R. Israel of Shklov’s Pe’at ha-Shulhan (1912).