Rabbi at Karasu-Bazar, in the Crimea, at the end of the seventeenth century. He was a native of Poland, whence his Tatar surname "Laḥni" (from "Liaḥ" = Poland). Abraham Firkowich claimed to have had in his possession a manuscript containing a work by David entitled "Mishkan David" (The Residence of David), which was divided into two parts, the first treating of the Hebrew roots and their significations, the second of Hebrew synonyms. David arranged and published the Crimean "Ḥazanya" ritual.