It is narrated from Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him): "Indeed, when the Messenger of Allah (peace and blessings be upon him) went out of Madinah (for a journey) and had covered the distance of one farsakh (about five and a half kilometres), he (peace and blessings be upon him) would shorten the prayer."
Imam Abu Bakr and Imam Ahmad bin Mani' also reported this same narration with their chains through Abu Harun. Likewise Imam Abd bin Humayd narrated it from Ali bin Asim, from Abu Harun, in these words: We set out (on a journey) with the Messenger of Allah (peace and blessings be upon him), and "when he (peace and blessings be upon him) had gone beyond the distance of one farsakh, he would shorten the prayer."
The narrator Abu Harun al-Abdi in the chain of this narration is da'if (weak).
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / أبواب الجمعة / 735
Hadith Gradingمحدثین:إسناده ضعيف
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :قال ابن حجر: أَبُو هَارُونَ ضَعِيفٌ . » «أخرجه مسند أحمد برقم: 5716، وأخرجه مجمع الزوائد ومنبع الفوائد برقم: 4306»