Resting, waiting

The body lay in the grave. It was Saturday, the sabbath, the seventh day of the week, the day of rest.

He rested.

In the first chapter of the Bible the Lord begins the act of creation on the first day of the week. 

On the sixth day he completes his work; 'the heavens and the earth were completed in their vast array.'

On the seventh day he rests: 'God had finished the work he had been doing; so on the seventh day he rested from all his work.'

In the same way, on the sixth day,  the Friday, the Son of God completed his work: 'It is finished' he cried from the cross

Then on the seventh day, like his Father, he rested.

Holy Saturday: This is the day of resting and waiting. 

Tomorrow is the first day of  the week, and it was on the first day that the Lord Jesus Christ emerged from the tomb alive. The New Creation had begun (on a Sunday, just as before).