It is narrated from Sayyiduna Sa'id bin al-Musayyib (may Allah have mercy on him) that the Messenger of Allah (peace and blessings be upon him) said: "People will remain upon goodness as long as they hasten in breaking the fast and do not delay like the people of the East."
Hadith Referenceالسنن المأثورة / باب ما جاء في تعجيل الفطر / 346
Hadith Takhrijمؤطا امام مالک، الصیام، باب ماجاء فی تعجیل الفطر، رقم : 7 ، شعب الایمان للبیہقی : 1432/3 مرسل