(a) Ziyad (may Allah have mercy on him), the freed slave of Banu Makhzum, said: A man came to Sayyiduna Ali (may Allah be pleased with him) and asked him about ablution, saying: Should I begin with the right or with the left? Sayyiduna Ali (may Allah be pleased with him) made a derisive sound at him (in mockery of his question), then called for water and began with the left before the right.
(b) Sayyiduna Ali (may Allah be pleased with him) said: I do not mind if I begin with the left before the right.
(c) Sayyiduna Ali (may Allah be pleased with him) said: I do not mind, when I complete my ablution, with which limb I begin.
(d) It is possible that what is meant by this is the hadith of Hafs bin Ghiyath. And Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الطهارة / 406