" إِنَّ اللَّهَ وَضَعَ عَنِ الْمُسَافِرِ نِصْفَ الصَّلاَةِ وَالصَّوْمَ وَعَنِ الْحُبْلَى وَالْمُرْضِعِ "
It was narrated from Anas that the Prophet said: "Allah has waived meaning half of the prayer and fasting for the traveler, and from pregnant women and the sick. "(Hanas)