I cut some potatoes and garlic with stainless steel knife and left the knife on cutting board without washing went out of city for imp meeting for two days now my question i use the knife or not is botulism toxin grow on that cutting board or knife?

You should wash the knife and cutting board before using it again. Once everything is cleaned, it would be ok to use it again. Good luck to you!

Clostridia botulinum is an anaerobic organism that does not thrive in the open air. But nonetheless, would suggest cleaning your kitchen utensils on a regular basis to avoid a variety of other infections.