Charles H. Spurgeon on Psalms 50:16

(second clause). Emphasis is laid on the phrase, to declare God's statutes, which both denotes such an accurate knowledge of them as one may obtain by numbering them, and a diligent and public review of them. Properly speaking the word is derived from the Arabic, and signifies to reckon in dust, for the ancients were accustomed to calculate in dust finely sprinkled over tablets of the Abacus. Hermann Venema.