Layla, the wife of Bashir (may Allah be pleased with him), said: I used to fast and join the fasts together (wisal, i.e. without breaking the fast). Bashir (may Allah be pleased with him) forbade me and said: The Messenger of Allah (peace and blessings be upon him) forbade me from this and said: "Only the Christians do this." Rather, fast as Allah, the Mighty and Majestic, has commanded: complete the fast until the night, and when night comes, break your fast.
Hadith Referenceالمعجم الكبير للطبراني / باب الباء / 1220