[Machine] Do I start with Safa before Marwah or Marwah before Safa? Do I pray before going around or go around before praying? Do I shave before slaughtering or slaughter before shaving? Ibn Abbas said, "Take that from the Book of Allah, for it is more deserving to be preserved." Allah the Exalted says, "Indeed, Safa and Marwah are among the symbols of Allah." [Surah Al-Baqarah, 2:158] So Safa comes before Marwah. And Allah the Exalted says, "And do not shave your heads until the sacrificial animal has reached its place of slaughter." Slaughtering comes before shaving. And Allah the Exalted says, "Purify My House for those who perform Tawaf and those who stand [in prayer] and those who bow and prostrate." [Surah Al-Hajj, 22:26] Tawaf comes before prayer.  

أَبْدَأُ بِالصَّفَا قَبْلَ الْمَرْوَةِ أَوْ بِالْمَرْوَةِ قَبْلَ الصَّفَا؟ وَأُصَلِّي قَبْلَ أَنْ أَطُوفَ أَوْ أَطُوفُ قَبْلَ أَنْ أُصَلِّيَ؟ وَأَحْلِقُ قَبْلَ أَنْ أَذْبَحَ أَوْ أَذْبَحُ قَبْلَ أَنْ أَحْلِقَ؟ فَقَالَ ابْنُ عَبَّاسٍ خُذْ ذَلِكَ مِنْ كِتَابِ اللهِ ﷻ فَإِنَّهُ أَجْدَرُ أَنْ يُحْفَظَ قَالَ اللهُ تَعَالَى {إِنَّ الصَّفَا وَالْمَرْوَةَ مِنْ شَعَائِرِ اللهِ} [البقرة 158] فَالصَّفَا قَبْلَ الْمَرْوَةِ وَقَالَ تَعَالَى {وَلَا تَحْلِقُوا رُءُوسَكُمْ حَتَّى يَبْلُغَ الْهَدْيُ مَحِلَّهُ} الذَّبْحُ قَبْلَ الْحَلْقِ وَقَالَ تَعَالَى {طَهِّرْ بَيْتِيَ لِلطَّائِفِينَ وَالْقَائِمِينَ وَالرُّكَّعِ السُّجُودِ} [الحج 26] الطَّوَافُ قَبْلَ الصَّلَاةِ