John Gill Commentary Exodus 30:9

"Ye shall offer no strange incense thereon, nor burnt-offering, nor meal-offering; and ye shall pour no drink-offering thereon." — Exodus 30:9 (ASV)

You shall offer no strange incense on it
Which had not the same, but was made of other materials, or had more or fewer; whatever was not exactly the same was not to be offered; and so to make use of other mediators than Christ, whether angels or men, or to put up prayer to God for the sake of our own righteousness, pleading the merits of our works, and not the blood, righteousness, and sacrifice of Christ, is to offer strange incense, unacceptable to God, and which will be of no avail to men:

nor burnt sacrifice, nor meat offering ;
these were to be offered and burnt upon the altar of burnt offering;

neither shall you pour drink offering on it ;
as upon the other altar; everything in God's worship and service was to be done in the proper place and order; these offerings and sacrifices, though they were by divine appointment, yet must be offered on that altar which was peculiar for them.