Sahl ibn Ziyad narrated from Ibn Mahbub, from Ali ibn Ri'ab, from Abu Ubaydah: I asked Abu Abdillah عليه السلام about a menstruating woman who sees purity while she is traveling and does not have enough water for her full ritual bath, and the time for prayer has arrived. Imam عليه السلام said: "If she has enough water to wash her private area, she should wash it, then perform tayammum (dry ablution) and pray." I asked: "Can her husband approach her in that state?" Imam عليه السلام said: "Yes, if she has washed her private area and performed tayammum."