John Gill Commentary 1 Samuel 10:7

"And let it be, when these signs are come unto thee, that thou do as occasion shall serve thee; for God is with thee." — 1 Samuel 10:7 (ASV)

And let it be, when these signs are come unto you
And are all fulfilled, especially the last:

that you do as occasion shall serve you :
as his circumstances would require, and as he in his great wisdom and prudence, with which he should now be furnished, would see necessary to prepare for his taking upon him the kingdom he was anointed to, and would be in a little time openly chosen to, and invested with. Some understand this of royal ornaments befitting a king, or of preparing arms for the defence of the kingdom:

for God is with you ;
or the Word of the Lord is your help, as the Targum, and therefore he need not fear engaging in any enterprise that might be for the glory of God, and good of the kingdom.