Al-Hasan (may Allah have mercy on him) narrates from Sayyiduna Abd al-Rahman bin Samurah (may Allah be pleased with him): We were with Sayyiduna Abd al-Rahman (may Allah be pleased with him) for two winters; we had not resolved to stay, so we used to shorten the prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 5478