Verses with the word assemblies in the Old Testament (6 verses):

Psalms 86:14
O God, the proud are risen against me, and the assemblies of violent men have sought after my soul; and have not set thee before them.

Ecclesiastes 12:11
The words of the wise are as goads, and as nails fastened by the masters of assemblies, which are given from one shepherd.

Isaiah 1:13
Bring no more vain oblations; incense is an abomination unto me; the new moons and sabbaths, the calling of assemblies, I cannot away with; it is iniquity, even the solemn meeting.

Isaiah 4:5
And the LORD will create upon every dwelling place of mount Zion, and upon her assemblies, a cloud and smoke by day, and the shining of a flaming fire by night: for upon all the glory shall be a defence.

Ezekiel 44:24
And in controversy they shall stand in judgment; and they shall judge it according to my judgments: and they shall keep my laws and my statutes in all mine assemblies; and they shall hallow my sabbaths.

Amos 5:21
I hate, I despise your feast days, and I will not smell in your solemn assemblies.