1611 KJV Bible. Exodus 19:1-6

"[1]In the third moneth when the children of Israel were gone forth out of the land of Egypt, the same day came they into the wildernesse of Sinai.
[2]For they were departed from Rephidim, and were come to the desert of Sinai, and had pitched in the wildernesse, and there Israel camped before the mount.
[3]And Moses went vp vnto God: and the Lord called vnto him out of the mountaine, saying, Thus shalt thou say to the house of Iacob, and tell the children of Israel:
[4]Ye haue seene what I did vnto the Egyptians, and how I bare you on Eagles wings, and brought you vnto my selfe.
[5]Now therfore if ye will obey my voice indeed, and keepe my couenant, then ye shall be a peculiar treasure vnto me aboue all people: for all the earth is mine.
[6]And ye shall be vnto me a kingdome of Priestes, and an holy nation. These are the wordes which thou shalt speake vnto the children of Israel."

Yes, we are saved by grace, but . . we are still to obey His Word . .
It will be great to be in heaven . .
How much better to arrive having done our best to follow the rules He so carefully laid out for believers in the New Testament!!