Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: Abu Isra'il vowed that he would fast, not sit, not take shade and not speak either. He was brought to the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) said: "Sit, take shade, speak, and make expiation for your oath." This is how I found it, "make expiation for the oath", and in my view this is a scribal error (tashif) for "and fast", as it is in all the other narrations.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب النذور / 20094