Hazrat Mu'tamir's father narrates that Hazrat Zaid bin Thabit, Hazrat Hudhaifa (may Allah be pleased with him), Hasan Basri, and Hazrat Ata did not consider it objectionable if a person feels moisture on his private part during prayer. However, Hazrat Ata says that if a drop actually comes out, then the ablution is broken. Hazrat Sa'id bin Musayyib says that if a drop of urine falls on your foot, there is no harm in it; neither is it necessary to repeat the prayer nor to perform ablution.