a honey jar spell might make them soften to you, but you need to show them you're sorry and prove to them how sorry you are.
question for you though is how long ago did this happen? if this was a week ago, you might consider giving them some time and breathing space before approaching them. after a few weeks, message, text, or call them, asking to all meet up to talk, and/or ask them how you can prove you're sorry.
during the few weeks apart you might want to do some soul searching and ask yourself if you really want to keep them as friends. i don't know the whole story, i don't know who's right and wrong, but sometimes it's better if a relationship ends. friend, lover, or family, if they are poison in your life, going your separate ways are normally best.