اصطبّ المَاءَ

is explained by Sb as signifying He took for himself the water; agreeably with general analogy: (M:) [but it is more properly rendered he poured out for himself the water:] one says, اِصْطَبَبْتُ لِنَفْسِى مَاءً مِنَ القِرْبَةِ لِأَشْرَبَهُ [I poured out for myself water from the skin that I might drink it]: and اِصْطَبَبْتُ لِنَفْسِى قَدَحًا [I poured out for myself a cup]. (TA.)

See also 6.

And see 7.