Psa 81:3, Isa 1:13, Eze 45:17, 46:1-3, Amo 8:5, Gal 4:10 | ESV | STEP | Blow the trumpet at the new moon , at the full moon , on our feast day .

Psalms 81:3

3 Blow the trumpet at ^athe new moon,
at the full moon, on our feast day.

Isaiah 1:13

13 Bring no more vain offerings;
incense is an abomination to me.
^bNew moon and Sabbath and the ^ccalling of convocations—
I cannot endure ^diniquity and ^esolemn assembly.

Ezekiel 45:17

17 ^fIt shall be the prince’s duty to furnish the burnt offerings, grain offerings, and drink offerings, at the feasts, the new moons, and the Sabbaths, all the appointed feasts of the house of Israel: he shall provide the sin offerings, grain offerings, burnt offerings, and peace offerings, to make atonement on behalf of the house of Israel.

Ezekiel 46:1-3

The Prince and the Feasts

1 “Thus says the Lord God: ^gThe gate of ^hthe inner court that faces east shall be shut on the six working days, but on the Sabbath day it shall be opened, and ⁱon the day of the new moon it shall be opened. 2 ^jThe prince shall enter by the vestibule of the gate from outside, and shall take his stand by ^kthe post of the gate. ^lThe priests shall offer his burnt offering and his peace offerings, and he shall worship at ^mthe threshold of the gate. Then he shall go out, but the gate shall not be shut until evening. 3 ⁿThe people of the land shall bow down at the entrance of that gate before the Lord on the Sabbaths and on the new moons.

Amos 8:5

5 saying, “When will ^othe new moon be over,
that we may sell grain?
And ^pthe Sabbath,
that we may offer wheat for sale,
that we may make ^qthe ephah small and the shekel ^{▼▼An ephah was about 3/5 bushel or 22 liters; a shekel was about 2/5 ounce or 11 grams} great
and deal deceitfully with false balances,

Galatians 4:10

10 ^sYou observe days and months and seasons and years!