Today is the Hilula of Rabbi David Ben Rabbi Zimra. He was known as the Radvaz and is the original teacher of the ARI – Rabbi Issac Luria.
It is reccomended that one light a candle as soon as possible Motzei Shabbat after Havdala in his honor and to connect to his energy.
Here is information about him from Wikipedia. The more one learns about a Tzadik on his Hilula the stronger the connection and the more available is His light to assist you in your spiritual work.
Rabbi David ben Solomon ibn (Abi) Zimra (Hebrew: דוד בן שלמה אבן אבי זמרא), also called Radbaz (רדב”ז) after the initials of his name, Rabbi David iBn Zimra, was an early Acharon of the fifteenth and sixteenth centuries who was a leading posek, rosh yeshiva, chief rabbi, and author of more than 3,000 responsa (halakhic decisions) as well as several scholarly works.1
In 1517, upon the abolition of the office of nagid by the Turkish government, the Radbaz moved to Cairo. There he was appointed Chief Rabbi of Egypt, a title he held for forty years. He was highly revered for his vast knowledge, integrity of character, and extensive philanthropy. Independently wealthy, the Radbaz was a successful merchant with business connections in other countries. The yeshiva which he founded and supported attracted many distinguished students, among them Bezalel Ashkenazi and Isaac Luria.
In the introduction to his commentary on Song of Songs, Isaac Akrish paints in vivid colors the character of the Radbaz, in whose house he lived for ten years. According to Akrish, the Radbaz was very prominent in both the social and the political life of Egypt, thanks to his status as a wealthy intellectual. During the time he served as Chief Rabbi, he introduced many reforms to the everyday life and religion of the Egyptian Jews. It was he who abolished the use of the Seleucid dating system in the Egyptian Jewish community and reintroduced the dating of years from Creation, as was done in other Jewish communities and continues to be done until the present day.
Upon attaining the age of 90, the Radbaz resigned the chief rabbinate and divided the greater part of his fortune among the poor, making special provision for Torah scholars. He then moved to Jerusalem. But he did not stay there long, due to the burdensome taxes that the Turkish government had imposed upon Jews. He settled in Safed, where he became an active member of the rabbinical court presided over by Yosef Karo, who held him in great esteem. He spent the last 20 years of his life in peace, continuing his learning and his writing.
The Radbaz died in Safed in 1573 at the age of 110 (some authorities say he was 94 years of age).4
- Divrei David (“Words of David”)|containing decisions and chiddushim (original Torah thoughts) on Maimonides‘ Mishneh Torah, published by Joseph Zamiro, together with his own work, Hon Yosef, Leghorn, 1828.
- Yekar Tiferet (“Honor of Excellency”)|containing answers to the criticisms of Abraham ben David on Maimonides’ Mishneh Torah and commentaries on those passages in that work which the Maggid Mishneh of Vidal of Tolosa overlooks; of these commentaries, the portions on Hafla’ah and Zera’im were published in Smyrna in 1757, and the remaining portions in the Vilna edition of the Mishneh Torah, 1890.
- Kelalei ha-Gemara (“Rules of the Gemara“)|a methodology of the Talmud, published in the collection Me-Harere Nemarim of Abraham ben Solomon Akra, Venice, 1599.
- Ohr Kadmon (“Pristine Light”)|a Kabbalistic work, edited by Moses Hagiz, Venice, 1713.
- Magen David (“Shield of David”)|a mystical explanation of the Hebrew alphabet opposing Recanati and Rabbi Judah Ḥayyaṭ, edited by Chagis, Amsterdam, 1713.
- Metzudat David (“The Bulwark of David”)|revealing reasons for the 613 commandments according to the four methods of explanation known as the “Pardes system” (Zolkiev, 1862).
- Michtam le-David (“David’s Poem”)|Kabbalistic homilies on the Song of Songs, still extant in manuscript.
- Keter Malkut (“Crown of Royalty”)|prayers for Yom Kippur, first published with the above-mentioned Ohr Kadmon, reprinted in the Shevet Musar of Elijah ben Abraham Solomon ha-Kohen of Smyrna, and finally inserted by Heidenheim in the ritual for the eve of Yom Kippur.
- Gilui le-Idrot|a commentary on the Idrot with notes by Rabbi Chaim Vital, still extant in manuscript in the Abarbanel Library in Jerusalem.
- Dinei Rabba ve-Zutra (“The Great and Small Decisions”)|a commentary on the Shulkhan Arukh.
- Shivim Panim la-Torah (“Seventy Faces to the Torah”)|the latter two works are mentioned in the preface of Magen David. The Radbaz’s responsa are his greatest contribution to Jewish literature; parts of it were published in Leghorn, 1651 (Nos. 1-300); Venice, 1799 (Nos. 1-318); Fürth, 1781 (Nos. 400-649); Leghorn, 1818 (Nos. 2051-2341). A complete edition of the responsa was published in Sudzilkow, 1836.