Sayyiduna Abu Hurayrah (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) said: "Shortening the salam is sunnah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 2990
Hadith Gradingمحدثین:منكر
Hadith Takhrij«منكر۔ اخرجه احمد 2/ 532/ 10898، ابوداود 1004»