Welcome quotes from Bram Stoker's "Dracula" are “Once again...welcome to my house. Come freely. Go safely; and leave something of the happiness you bring,” and “Enter freely and of your own free will!” GoodReads.com, GIGA-USA.com, BrainyQuote.com and WiseOldSayings.com are some sources for welcoming quotes.
GoodReads.com, a site for readers and book recommendations, also provides quotes, including Christopher Moore's “Only cops and vampires have to have an invitation to enter.”
GIGA-USA.com provides several welcoming quotes from William Shakespeare, including "A hundred thousand welcomes: I could weep, And I could laugh; I am light and heavy: Welcome." It also offers Amos Bronson Alcott's "Stay is a charming word in a friend's vocabulary." Quotes offered include those by William Cullen Bryant, Henry Wadsworth Longfellow, Lord Byron and Sir Walter Scott.