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"Is not this David, of whom they sang one to another in dances, saying, Saul slew his thousands, and David his ten thousands?"

Isn't this David, the one people sang about while dancing, who said that Saul killed thousands, and he, David, killed tens of thousands?

"Now the acts of David the king, first and last, behold, they are written in the book of Samuel the seer, and in the book of Nathan the prophet, and in the book of Gad the seer,"

Now, David the king's actions, from beginning to end, can be found in the books of Samuel, Nathan, and Gad, who were all seers or prophets.

"And if he be poor, and cannot get so much; then he shall take one lamb for a trespass offering to be waved, to make an atonement for him, and one tenth deal of fine flour mingled with oil for a meat offering, and a log of oil;"

If he is poor and can't afford much, then he should take one small lamb for a sin offering to wave, to forgive his sins. He also needs to get a mix of flour and oil for a food offering, along with a bottle of oil.