Wudu is not required for sa'i between Safa and Marwah according to the consensus of scholars from all four schools of jurisprudence. Unlike طواف, where the requirement of وضو is debated, scholars unanimously agree that sa'i is valid without وضو. This is a significant practical relief for حجاج, especially during the extreme crowding and heat of حج season when maintaining ablution is very difficult.
The evidence for this ruling is clear. نبی کریم (صلی اللہ علیہ وسلم) told Aisha when she was menstruating: 'Do everything the حجاج do, but do not perform طواف around the House.' This hadith explicitly permitted her to perform sa'i (and all other rites) while in a state of menstruation, which is a greater state of ritual impurity than minor hadath. If sa'i is valid without the major purification (غسل) required after menstruation, it is certainly valid without the minor purification (وضو).
Sheikh Ibn Baz and Sheikh Ibn Uthaymeen both confirmed that while performing sa'i with وضو is better and more rewarding — as وضو is مستحب for all acts of worship — it is not a condition of validity. A حاجی who breaks وضو during sa'i may continue without renewing it. The Permanent Committee issued the same ruling, emphasizing that this is a matter of scholarly agreement (ijma') and there is no significant dispute on this point.