Regarding sitting party in the sun and party in the shade

Narrated AbuHurayrah:

AbulQasim (ﷺ) said: When one of you is in the sun (Shams)--Makhlad's version has "fay'"--and the shadow withdraws from him so that he is partly in sun and partly in shade, he should get up.

حَدَّثَنَا ابْنُ السَّرْحِ، وَمَخْلَدُ بْنُ خَالِدٍ، قَالاَ حَدَّثَنَا سُفْيَانُ، عَنْ مُحَمَّدِ بْنِ الْمُنْكَدِرِ، قَالَ حَدَّثَنِي مَنْ، سَمِعَ أَبَا هُرَيْرَةَ، يَقُولُ قَالَ أَبُو الْقَاسِمِ صلى الله عليه وسلم ‏"‏ إِذَا كَانَ أَحَدُكُمْ فِي الشَّمْسِ ‏"‏ ‏.‏ وَقَالَ مَخْلَدٌ ‏"‏ فِي الْفَىْءِ ‏"‏ ‏.‏ ‏"‏ فَقَلَصَ عَنْهُ الظِّلُّ وَصَارَ بَعْضُهُ فِي الشَّمْسِ وَبَعْضُهُ فِي الظِّلِّ فَلْيَقُمْ ‏"‏ ‏.‏

Qais quoted his father as saying that he (his father) came when the Messenger of Allah (ﷺ) was addressing. He stood in the sun. He ordered him (to shift) and he shifted to the shade.

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ إِسْمَاعِيلَ، قَالَ حَدَّثَنِي قَيْسٌ، عَنْ أَبِيهِ، أَنَّهُ جَاءَ وَرَسُولُ اللَّهِ صلى الله عليه وسلم يَخْطُبُ فَقَامَ فِي الشَّمْسِ فَأَمَرَ بِهِ فَحُوِّلَ إِلَى الظِّلِّ ‏.‏