9:5a then I will establish your royal throne over Israel forever,

then I will make firm/strong forever the royal power of your family line/dynasty over ⌊the nation of⌋ Israel,
-or-
Then I will always allow/cause a man from your line/descendants to rule/reign over⌊the people of⌋ Israel.

9:5b as I promised your father David when I said,

as I promised David your (sing) father. I said ⌊to him⌋,
-or-
This is what I said to your father David:
-or-
I promised your father David that

9:5c ‘You will never fail to have a man on the throne of Israel.’

‘You (sing) will certainly have a successor/descendant on the throne of Israel.’
-or-
‘One of your (sing) descendants/sons will rule over Israel forever.’
-or-
one of his sons will/would always be king of the people of Israel.

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