1:25a For today he has gone down and sacrificed an abundance of oxen, fattened calves, and sheep,

This very day he/Adonijah has gone away and slaughtered a large quantity of cattle/bulls, fat calves, and sheep ⌊for a feast⌋.
-or-
Today Adonijah left ⌊Jerusalem⌋ and ordered many beef-cattle and young/fat buffaloes/cattle and sheep to be killed ⌊to celebrate⌋.

1:25b and has invited all the sons of the king, the commanders of the army, and Abiathar the priest.

He has invited all the royal sons/princes, the generals/officers of the king’s army, and the leading/senior priest Abiathar ⌊to the feast⌋.
-or-
He asked all your ⌊other⌋ sons and military leaders, and ⌊God’s⌋ priest Abiathar to be present.

1:25c And behold, they are eating and drinking before him, saying,

And there they are, eating and drinking with Adonijah and saying,
-or-
And while they are feasting and celebrating with him, they are shouting,

1:25d ‘Long live King Adonijah!’

‘Long live the ⌊new⌋ king Adonijah!’
-or-
‘May King Adonijah live/prosper/reign for a long time!’

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