God created the heavens, the earth and all that exists in six days and rested on the seventh day.  He called the seventh day, the Sabbath.  The biblical Sabbath day is Saturday.  God commands his believers to remember the Sabbath Day and to keep it Holy.  Therefore, we believe to honour the Sabbath by worshipping together on Saturday.

"Remember the Sabbath day, to keep it holy. Six days you shall labor and do all your work, but the seventh day is the Sabbath of the LORD your God. In it you shall do no work: you, nor your son, nor your daughter, nor your male servant, nor your female servant, nor your cattle, nor your stranger who is within your gates. For in six days the LORD made the heavens and the earth, the sea, and all that is in them, and rested the seventh day. Therefore the LORD blessed the Sabbath day and hallowed it.  Exodus 20:8-11

Thus the heavens and the earth, and all the host of them, were finished. And on the seventh day God ended His work which He had done, and He rested on the seventh day from all His work which He had done. Then God blessed the seventh day and sanctified it, because in it He rested from all His work which God had created and made.  Genesis 2:1-3

Now when evening had come, because it was the Preparation Day, that is, the day before the Sabbath...  Mark 15:42

Now after the Sabbath, as the first day of the week began to dawn, Mary Magdalene and the other Mary came to see the tomb.  Matthew 28:1

"Do not think that I came to destroy the Law or the Prophets. I did not come to destroy but to fulfill. For assuredly, I say to you, till heaven and earth pass away, one jot or one tittle will by no means pass from the law till all is fulfilled. Whoever therefore breaks one of the least of these commandments, and teaches men so, shall be called least in the kingdom of heaven; but whoever does and teaches them, he shall be called great in the kingdom of heaven.  Matthew 5:17-19

So He came to Nazareth, where He had been brought up. And as His custom was, He went into the synagogue on the Sabbath day, and stood up to read.  Luke 4:16

Then Paul, as his custom was, went in to them, and for three Sabbaths reasoned with them from the Scriptures,  Acts 17:2

And he reasoned in the synagogue every Sabbath, and persuaded both Jews and Greeks.  Acts 18:4

That day was the Preparation, and the Sabbath drew near.
And the women who had come with Him from Galilee followed after, and they observed the tomb and how His body was laid. Then they returned and prepared spices and fragrant oils. And they rested on the Sabbath according to the commandment.  Luke 23:54-56

All passages noted on this page are sourced from the New King James Version bible.