Silsilah as-Sahihah 2678 — Prohibition of being partly in sun

Abu Huraira (may Allah be pleased with him) reports that Abu al-Qasim (peace and blessings of Allah be upon him) said: "When a person is sitting in the shade and, due to the shade shrinking, part of his body comes under the sun and part remains in the shade, then he should get up from there."