Our parsha tells us of preparations for the flood and then of the flood itself The division between the aliyot is as follows: ‘Rishon’ speaks of the building of the ark in ‘sheni’ the Torah tells us how the inhabitants of the ark the animals enter. We should notice a change in the two parts of the story. The story of building the ark starts with doing:
Make for yourself a ark make it out of wood and cover it with tar both inside and out
Why did could trouble Noach to build the ark when he could have saved him in another way? It was in order that the generation of the flood will see him working for 120 years and ask what he is doing. He was to tell them that Gd is bringing a food to the world and perhaps they will relent.
Noach built the ark over 120 years! one hundred and twenty years of hard work! A three level ship. We can imagine the hammers the nails and the saws. So much activity! Then after doing all he was told to do:
And Noach did all he was commanded by God to do