John Gill Commentary 1 Samuel 12:7

"Now therefore stand still, that I may plead with you before Jehovah concerning all the righteous acts of Jehovah, which he did to you and to your fathers." — 1 Samuel 12:7 (ASV)

Now therefore stand still
Keep your place, and do not as yet break up the assembly, but wait a little longer patiently, and with reverence and attention hearken to what I have further to say:

that I may reason with you before the Lord ;
as in his presence; and which he observes to command the greater awe upon their mind, and the greater regard to the subject of his discourse and resolutions; which would be,

of all the righteous acts of the Lord, which he did to you and to your
fathers ;
not only in a way of judgment delivering them into the hands of their enemies, when they sinned against him, but rather in a way of mercy and kindness in delivering them out of their hands.