Book of Lamentations
The oldest abecedarii found are of Semitic origin. In fact, all of the confirmed acrostics in the Hebrew Bible are alphabetic. These occur in four of the five chapters that make up the "Book of Lamentations", in the praise of the good wife in Proverbs 31:10-31, and in Psalms 25, 34, 37, 111, 112, 119, and 145.