Answer:
I row quickly with four oars but never comes out from under my own roof.
If two's company and three's a crowd what are four and five?
Without a bridle or a saddle across a thing I ride a-straddle. And those I ride by help of me though almost blind are made to see.
I jump when I walk and sit when I stand.
Glittering points that downward thrust. Sparkling spears that never rust.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?