Observed weekly at the appointed time by Yahusha, the Emissaries and the Congregation:
Luke 4:16 (HARV) And he came to Nazareth, where he had been brought up: and, as his custom was, he went into the synagogue on the Sabbath day, and stood up for to read.

Passover/Phesach  פסח

Commanded :
Exodus 12. Leviticus 23:5

Observed yearly (Exo 13:10) at the appointed time by Ysrael, Yahusha, the Emissaries and the Congregation:
Matthew 26:2, 17-19
Mark 14:12-16
Luke 2:41-42; 22:1, 7-20
John 2:13, 23; 6:4; 13:1-30
1 Corinthians 11:23-29 (HARV) But let a man examine himself, and so let him eat of that bread, and drink of that cup. For he that eateth and drinketh unworthily, eateth and drinketh damnation to himself, not discerning the body of Messiah.

Unleavened Bread/Matsuath  מצת 

Commanded:
Leviticus 23:6-8

Observed yearly at the appointed time by Ysrael, Yahusha, the Emissaries and the Congregation:
Matthew 26:17
Mark 14:12
Luke 2:41-42, 22:1-7
Acts 20:6 (HARV) And we sailed away from Philippi after the days of unleavened bread, and came unto them to Troas in five days; where we abode seven days.
1 Corinthians 5:6-8 (HARV)  Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.

Pentecost/Shabuah   שבועות

Commanded:
Leviticus 23:15-22

Observed yearly at the appointed time by Ysrael, Yahusha, the Emissaries and the Congregation:
Acts 2:1-21; 20:16
1 Corinthians 16:8 (HARV) But I will tarry at Ephesus until Pentecost.

Trumpets/Tharuah   תרועה 

Commanded:
Leviticus 23:23-25

Observed yearly at the appointed time by Ysrael, Yahusha, the Emissaries and the Congregation:
Matthew 24:30-31
1 Thessalonians 4:16-17

Atonement/Yum Kapherym   יום ענה

Commanded:
Leviticus 23:26-32

Observed yearly at the appointed time by Ysrael, Yahusha, the Emissaries and the Congregation:
Acts 27:9 (HARV) Now when much time was spent, and when sailing was now dangerous, because the fast was now already past, Paul admonished them.

Tabernacles/Sakuth   סכה 

Commanded:
Leviticus 23:33-43

Observed yearly at the appointed time by Ysrael, Yahusha, the Emissaries and the Congregation
John 7:1-2, 8, 10, 14
Acts 18:21 (HARV) But bade them farewell, saying, I must by all means keep this feast that cometh in Jerusalem: but I will return again unto you, if Yahuah will. And he sailed from Ephesus.

Last Great Day/Atseret  שמיני

Commanded in Old Testament:
Leviticus 23:36

Observed yearly at the appointed time by Ysrael, Yahusha, the Emissaries and the Congregation:
John 7:37-38 (HARV) In the last day, that great day of the feast, Yahusha stood and cried, saying, If any man thirst, let him come unto me, and drink. 38He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water.

New Moon/Chadash   חדש

Celebrated in Old Testament: