Scriptures all state that we are to worship on the
new moons, but do not mention them as Sabbaths. The only scripture that makes a
hint at it is Amos 8:5.
And then there is a non scriptural source by Horace who was a Latin lyric poet and satirist under the emperor Augustus who lived from 65 BC to 8
BC that makes mention of it being a Sabbath;.
Here the expression "thirtieth Sabbath" refers to the 30th and 31st days of each month which were set aside by the king of Isreal for a festive meal, 1 Samuel 20. Thus it was common knowledge in the Roman Empire that Jews rested on the first of the two possible days on which the new crescent (new moon) might be seen.
As far as the scriptures, they only state that we are to worship before
the Lord with burnt offering on the
Ezekiel 46:3 "Likewise the people of the land shall worship at
the door of this gate before the Lord in the Sabbaths and in the new
Isaiah 66:23 "And it shall come to pass, that from one new moon
to another, and from one Sabbath to another, shall all flesh come to worship
before me, saith the Lord."
Amos 8:5 "Saying, When will the new moon be gone, that we may
sell corn? and the sabbath, that we may set forth wheat,"
Numbers 10:10 "Also in the day of your gladness, and in your
solemn days, and in the beginings of your months, ye shall blow with the
trumpets over your burnt offerings, and over the sacrifices of your peace
offerings; that they may be to you for a memorial before your God: I am the
Lord your God."
Numbers 28:11 "And in the beginnings of your months ye shall
offer a burnt offering unto the Lord; two young bullocks, and one ram, seven
lambs of the first year without spot;"
1 Samuel 20:5 "And David said unto Jonathan, Behold, to morrow
is the new moon, and I should not fail to sit with the king at meat: but let
me go, that I may hide myself in the field unto the third day at even."
1 Samuel 20:18 "Then Jonathan said to David, To morrow is the
new moon: and thou shalt be missed, because thy seat will be empty."
2 Kings 4:22-23 "And she called unto her husband, and said, Send
me, I pray thee, one of the young men, and one of the asses, that I may run
to the man of God, and come again. And he said, Wherefore wilt thou go to
him to day? it is neither new moon, nor sabbath. And she said, It shall be
2 Chronicles 2:4 "Behold, I build an house to the name of the
Lord my God, to dedicate it to him, and to burn before him sweet incense,
and for the continual shewbread, and for the burnt offerings morning and
evening, on the Sabbaths, and on the new moons, and on the solemn feasts of
the Lord our God. This is an ordinance for ever to Israel."
2 Chronicles 8:13 "Even after a certain rate every day, offering
according to the commandment of Moses, on the Sabbaths, and on the new
moons, and on the solemn feasts, three times in the year, even in the feast
of unleavened bread, and in the feast of weeks, and in the feast of
2 Chronicles 31:3 "He appointed also the king's portion of his
substance for the burnt offerings, to wit, for the morning and evening burnt
offerings, and the burnt offerings for the Sabbaths, and for the new moons,
and for the set feasts, as it is written in the law of the Lord."
Nehemiah 10:32-33 "Also we made ordinances for us, to charge
ourselves yearly with the third part of a shekel for the service of the
house of our God; For the shewbread, and for the continual meat offering,
and for the continual burnt offering, of the sabbaths, of the new moons, for
the set feasts, and for the holy things, and for the sin offerings to make
an atonement for Israel, and for all the work of the house of our God."
Ezra 3:5 "And afterward offered the continual burnt offering,
both of the new moons, and of all the set feasts of the Lord that were
consecrated, and of every one that willingly offered a freewill offering
unto the Lord."
Psalms 81:3 "Blow up the trumpet in the new moon, in the time
appointed, on our solemn feast day."
Ezekiel 46:1-3 "Thus saith the Lord GOD; The gate of the inner
court that looketh toward the east shall be shut the six working days; but
on the sabbath it shall be opened, and in the day of the new moon it shall
be opened. And the prince shall enter by the way of the porch of that gate
without, and shall stand by the post of the gate, and the priests shall
prepare his burnt offering and his peace offerings, and he shall worship at
the threshold of the gate: then he shall go forth; but the gate shall not be
shut until the evening. Likewise the people of the land shall worship at the
door of this gate before the LORD in the sabbaths and in the new
Hosea 2:11 "I will also cause all her mirth to cease, her feast
days, her new moons, and her sabbaths, and all her solemn feasts."
Colossians 2:16 " Let no man therefore judge you in meat, or in
drink, or in respect of an holyday, or of the new moon, or of the sabbath
As with the Festival of Tabernacles, only the first day is a Sabbath, yet
sacrifices and offerings were made each of the days. So it appears the new moon
is not a Sabbath.