Isma'il bin Abd al-Rahman said that Ibn Umar (may Allah be pleased with them both) was called on Friday, while he was preparing for the Friday prayer, to Sa'id bin Zayd bin Amr bin Nufayl (may Allah be pleased with him), who was dying. So he went to him and left the Friday prayer.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الجمعة / 5643