Can God Lie?

Anyone who has ever read the Bible knows that God can speak. Over the course of six days, God speaks the world into existence and then speaks to both Adam and Eve in the Garden of Eden. Later he speaks to Cain and Abel, to Noah, to Abraham and many others. What sorts of things does God say? He issues commands – ‘Let there be light!’ – he lays down prohibitions – ‘Don’t eat from that tree!’ – and he asks questions, metes out punishments, offers advice, forecasts the weather, and orders an old man to kill his only son. Sometimes he says these things calmly, sometimes sarcastically, occasionally his words are filled with anger or pity or love. When God speaks people listen, but when people listen, should they always believe him? In other words, can God lie?