Sharing of patterns is a copyright violation. Even some free patterns don't want you sharing, they want you to direct the person to their website. If it's a pattern in a book I suggest trying the libraries or used books if you don't want to buy a new one.
Another thought.. if you can tell us what the pattern looks like or link to it we can maybe find a acceptable alternative. There are an awful lot of patterns that are similar to some other one. Or three.