“I once asked abu Ja‘far (a.s.), about a man who sails in a boat while naked or his clothes are looted and does not find anything to perform Salah (prayer) with. He (the Imam) said, ‘He performs Salah (prayer) by making gestures and a woman in such condition places her hand over her vagina, and if a man, he places his hand over his private part. They sit and make gestures and do not perform Sajdah (prostration) or Ruku‘ (bowing down on one’s knees) so their back is exposed. Their Salah (prayer) is by gestures by their heads.’ He (the Imam) said, ‘If they are in water or sea with waves they do not perform Sajdah (prostration) and they are exempt from facing (the direction of al- Qiblah (al-Ka‘bah)). They make gestures: their rising and lowering is gestures.’”