Sforno on Exodus 37/ספורנו על שמות ל״ז

1ויעש את שמן המשחה קדש, he meant for it to be enduring infinitely (not to evaporate or otherwise disintegrate). We have encountered the meaning of the word קדש in this sense already on Exodus 30,31קדש יהיה לכם ולדורותיכם, “it shall be sacred for you as it will last throughout your generations.”

2ואת קטורת הסמים טהור; with spices from which any foreign elements had been carefully removed, i.e. טהור, “pure, unadulterated.”