The many times that the "Sabbath" of the LORD is given in the Old Testament (Genesis to Malachi)
Genesis 2:1-3; (see also, Genesis 18:19, 26:5, &c.)
The sabbath commandment in the beginning with God (Genesis 2:1-3; Exodus 20:8-11; Psalms 119:142).
The sabbath commandment with Adam (Mark 2:27).
The sabbath commandment with Enoch (Genesis 5:22,24; Hebrews 11:5; Isaiah 58:13)
The sabbath commandment with Noah (Genesis 6:9; 2 Peter 2:5; Psalms 119:172).
The sabbath commandment with Eber (Genesis 10:21,24-25; Exodus 3:18, 5:3, 7:16).
The sabbath commandment with Abaham (Genesis 17:9, 18:19, 26:5; 2 Chronicles 20:7; Isaiah 41:8; James 2:23; John 15:14).
The sabbath commandment with Isaac (Genesis 17:9, 18:19, 26:5).
The sabbath commandment with Jacob/Israel (Genesis 17:9, 18:19, 26:5, 32:28).
The sabbath commandment with Moses (Exodus 5:4-5;, 16:1-36, 20:8-11; Deuteornomy 5:12-15, 31:12-18). ...
The sabbath commandment with Jesus (Luke 4:16-19).
The sabbath commandment with the Apostles/Disciples (Acts 1:2, (4:24), 13:14,27,42,44, (14:15), 15:21, 16:13, 17:2, 18:4; Hebrews 3:11,18, 4:1,3,4,5,8,9,10,11; Revelation 1:10, 10:6, 12:17, 14:6-7)
The sabbath commandment with us today (Hebrews 4:9; Revelation 12:17, 14:6-7; John 14:15; Exodus 20:6,8-11).
The sabbath commandment on into eternity (Isaiah 66:23).
Exodus 5:4-5,8-9, 16:23-30, 20:8-11, 23:12, 31:12-18, 34:21, 35:1-3
Leviticus 19:3,30, 23:3,11,15-16,38, 24:8, 26:2
Numbers 15:32, 28:9
Deuteronomy 5:12-15
2 Kings 4:23, 11:5,7,9, 16:18
1 Chronicles 9:32, 23:31
2 Chronicles 2:4, 8:13, 23:4,8, 31:3
Nehemiah 9:6,14, 10:31,33, 13:15-22
Psalms 92:1, 146:6
Isaiah 56:2,4,6, 58:13, 66:23
Jeremiah 17:21-27
Ezekiel 20:12-24, 22:8,26, 23:38, 44:24, 46:1,3-4,12
Amos 8:5
The many times that the "Sabbath" of the LORD is given in the New Testament:
Matthew 12:1,2,5,8,10,11,12, 24:20, 28:1;
Mark 1:21, 2:23,24,27,28, 3:2,4, 6:2, 7:6-9, 15:42, 16:1;
Luke 4:16,31, 6:1,2,5,6,7,9, 13:10,14,15,16, 14:1,3,5, 23:54,56;
John 5:9,10,16,18, 7:22,23, 9:14,16, 12:1 (calculated), 19:31;
Acts 1:2, 13:14,27,42,44, 15:21, 16:13, 17:2, 18:4;
Additional references are:
John 12:1 (six days before the Passover, Jesus was at Lazarus' house, on Sabbath)
Hebrews 3:11, 4:1,3,4,5,8,9,10,11; [Hebrews 4:9 "rest" Greek: sabbatismos, literal sabbath-keeping]
Revelation 1:10 [kuriake hemera, "the Lord's Day" [the 7th Day Sabbath, not "the Day of the Lord", this is totally different in the Greek], see Genesis 2:1-3, Exodus 20:8-11, Deuteronomy 5:12:15, Isaiah 58:13, 66:23, Matthew 12:8, Mark 2:27,28; Luke 6:5 ], Revelation 10:6 [see also Exodus 20:11, 31:17; Nehemiah 9:6; Psalms 146:6; Acts 4:24, 14:15, Revelation 14:7]; Revelation 14:7 [see previous], etc
Additionally, further references in the Greek are [every single 'first [day] of the week' text, as each text clearly shows that the first day is simply a number, with no special association or designation, other than it is simply one day toward the culmination of the week, being the 7th Day the Sabbath of the LORD thy God]:
Matthew 28:1(a) - (Koine Greek) οψε δε σαββατων (Transliterated) oye de sabbatwn
Matthew 28:1(b) - (Koine Greek) εις μιαν σαββατων (Transliterated) eiV mian sabbatwn
Mark 16:2 - (Koine Greek) και λιαν πρωι της μιας σαββατων (Transliterated) kai lian prwi ths mias sabbatwn
Mark 16:9 - (Koine Greek) αναστας δε πρωι πρωτη σαββατου (Transliterated) anastas de prwi prwth sabbatou
Luke 24:1 - (Koine Greek) τη δε μια των σαββατων (Transliterated) th de mia twn sabbatwn
John 20:1 - (Koine Greek) τη δε μια των σαββατων (Transliterated) th de mia twn sabbatwn
John 20:19 - (Koine Greek) τη μια των σαββατων (Transliterated) th mia twn sabbatwn
Acts 20:7 - (Koine Greek) εν δε τη μια των σαββατων (Transliterated) en de th mia twn sabbatwn
1 Corinthians 16:2 - (Koine Greek) κατα μιαν σαββατων (Transliterated) kata mian sabbatwn
That the Sabbath [of the Lord thy God], [being] the 7th day, is always the culmination of the week in God's Created order and is always referred to as such in all of scripture.
Therefore, every single “first [day] of the week” text upholds the 7th Day Sabbath, and is undeniable evidence of its continued existence and prominence.