The clearest examples of haikus I’ve found are this source: 10 Vivid Haikus to Leave You Breathless. While you may not be left “breathless,” the examples are from classic authors and show good us of the form. On this page are those from two traditional Japanese poets:
“The Old Pond” by Matsuo Bashō
An old silent pond
A frog jumps into the pond—
Splash! Silence again.
“A World of Dew” by Kobayashi Issa
A world of dew,
And within every dewdrop
A world of struggle.
And two contemporary poets:
Sonia Sanchez “Haiku [for you]”
love between us is
speech and breath. loving you is
a long river running.
Ravi Shankar “Lines on a Skull”
life’s little, our heads
sad. Redeemed and wasting clay
this chance. Be of use.