New International Version
12 “Observe the Sabbath day by keeping it holy, as the Lord your God has commanded you. 13 Six days you shall labor and do all your work, 14 but the seventh day is a sabbath to the Lord your God. On it you shall not do any work, neither you, nor your son or daughter, nor your male or female servant, nor your ox, your donkey or any of your animals, nor any foreigner residing in your towns, so that your male and female servants may rest, as you do. 15 Remember that you were slaves in Egypt and that the Lord your God brought you out of there with a mighty hand and an outstretched arm. Therefore the Lord your God has commanded you to observe the Sabbath day.
Thursday - March 17 (3rd Commandment)
“Our word ‘holy day’ or ’holiday’ is… from the Hebrew word ‘Sabbath,’ which properly means to rest, that is, to cease from work… In the Old Testament, God set apart the seventh day, appointed it for rest, and commanded it to be kept holy above all other days. As far as outward observance is concerned, the commandment was given to the Jews alone. They were to refrain from hard work and to rest, so that both human beings and animals might be refreshed and not be exhausted by constant labor. In time, however, the Jews interpreted this commandment too narrowly and grossly misused it. They slandered Christ and would not permit him to do [good things] as if the commandment could be fulfilled by refraining from work of any kind. This was not its intention…” (Luther’s Large Catechism).