'Sinning' in the Bible

Then it was said to Saul, See, the people are sinning against the Lord, taking the blood with the flesh. And he said to those who gave him the news, Now let a great stone be rolled to me here.

For he put his life in danger and overcame the Philistine, and the Lord gave all Israel salvation: you saw it and were glad: why then are you sinning against him who has done no wrong, desiring the death of David without cause?