When is the Sa'y (walking between al-Safa and al-Marwah) performed in Hajj?

Question : Yes, is the sa'y obligatory after the arrival tawaf, or after the tawaf of ifadah, or after the farewell tawaf?

Answer : As for the farewell tawaf, there is no sa'y after it. As for the tawaf of ifadah, if the pilgrim is performing tamattu' (combining 'Umrah and Hajj with a break between them), then he must perform the sa'y after it, yes. Because the sa'y performed upon arrival was for the 'Umrah. However, if the pilgrim is performing qiran (combining 'Umrah and Hajj in one ihram) or ifrad (performing Hajj alone), then if he has already performed the sa'y after the arrival tawaf, he owes no sa'y after the tawaf of ifadah. But if he did not perform the sa'y after the arrival tawaf, then he must perform the sa'y after the tawaf of ifadah. As for the arrival tawaf, which is the tawaf performed first upon arrival, if the person is performing tamattu', then he must perform the sa'y after it because he is performing 'Umrah, and 'Umrah requires both tawaf and sa'y. If he is performing ifrad or qiran, he may perform the sa'y after the arrival tawaf, or he may delay it until after the tawaf of ifadah.
And with this it becomes clear that there is no sa'y after the farewell tawaf in any case. And as for the tawaf...
...of ifadah and the arrival tawaf, meaning the tawaf performed first upon arrival, each of them is followed by sa'y in all cases if the person is performing tamattu'. As for if he is performing qiran or ifrad, he owes only one sa'y; if he wishes, he may perform it after the tawaf performed first upon arrival, i.e., after the arrival tawaf, and if he wishes, he may perform it after the tawaf of ifadah.