Muhammad bin Sirin (may Allah have mercy on him) said: I was informed that Ibn Abbas (may Allah be pleased with them both) said that when the Prophet (peace and blessings be upon him) went from Madinah to Makkah, he feared none but Allah, and still he (peace and blessings be upon him) would shorten the prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5386