Can anybody help me and write a few quotes from Macbeth about the responsibility of Duncans murder?

Well, you can have a good look at these excerpts:

a) "..........why do I yield to that suggestion

Whose horrid image doth unfix my hair

And make my seated heart knock at my ribs

Against the use of nature?" (Macbeth) [act1 sc.3]

b) "                The raven himself is hoarse

That croaks the fatal entrance of Duncan

Under my battlements." (Lady Macbeth) [act1 sc.5]

c)  " .............He's here in double trust.

First, as I am his kinsman and his subject,

Strong both against the deed; then, as his host,

Who should against his murderer shut the door,

Not bear the knife myself." (Macbeth) [act1 sc.7]

d)  "                 When Duncan is asleep--

......................his two chamberlains

Will I with wine and wassail so convince,

That memory shall be fume..................

What cannot you and I perform upon

The unguarded Duncan?" (Lady Macbeth) [act1 sc.7]

e)  " There's daggers in men's smiles: the near in blood,

The nearer bloody." (Donalbain) [act2 sc.3]

f)  " Thou hast it now: King, Cawdor, Glamis, all,

As the weird women promis'd, and I fear

Thou play'dst most foully for 't." (Banquo) [act3 sc.1]

Hopefully, you can find many more.