John Gill Commentary Psalms 35:28

"And my tongue shall talk of thy righteousness [And] of thy praise all the day long." — Psalms 35:28 (ASV)

And my tongue shall speak of your righteousness
In vindicating his cause, and bringing his enemies to shame and confusion, as well as of the glory and excellency of that righteousness of his, by which he was justified in his sight, and from which his inward peace and prosperity flowed:

[and] of your praise all the day long ;
for the many mercies, temporal and spiritual, he was every day favoured with.