Here are dozens of scriptures that use the exact word, G4137, that Jesus used in Matthew 5:17:
Matthew 1:22, 2:15, 2:17, 2:23, 3:15, 4:14, 8:17, 12:17, 13:35, 13:48, 21:4, 23:32, 26:54, 26:56, 27:9, 27:35,
Mark 1:15, 14:49, 15:28
Luke 1:20, 2:40, 3:5, 4:21, 7:1, 9:31, 21:22, 21:24, 22:16, 24:44
John 3:29, 7:8, 12:3, 12:38, 13:18, 15:11, 15:25, 16:6, 16:24, 17:12-13, 18:9, 18:32, 19:24, 19:36
Acts 1:16, 2:2, 2:28, 3:18, 5:3
"Do not think that I have come to take away the law and the writings of the prophets. No, I have not come to take them away. But I have come to do what they say must be done." Matthew 5:17
Our deeds and actions do matter. Grace is sufficient to save us -- we are all saved by the grace of YHWH. His saving us means that we will know Him and love Him and desire to honor and even obey Him. How can we obey, honor and serve Him if we believe His son came to abolish the Law He sent Him to consummate!
The Holy Spirit lives in us now, in our hearts, we ARE the Temple of GOD now, so that we may walk in faith and obedience at a much deeper level than was possible before the Messiah came. We should now seek to obey (admittedly, not always successfully) the great moral and spiritual law which lies behind the Ten Commandments.
It is impossible to love Yeshua fully if we do not obey Him. He said this, too.
"If you love me, keep my commandments." John 14:15