Monks who are not worthy and worthy I have seen certain suttas where the Buddha explains about the qualities of monks who are and who are not worthy of gifts, salutation and etc.

Where can I find the Suttas? References are appreciated.
From the Ajañña Sutta (AN 8.13):


  "In the same way, a monk endowed with eight qualities is worthy of
  gifts, worthy of hospitality, worthy of offerings, worthy of respect,
  an incomparable field of merit for the world. Which eight?
  
  (1) "There is the case where a monk is virtuous. He dwells restrained
  in accordance with the Patimokkha, consummate in his behavior &amp; sphere
  of activity. He trains himself, having undertaken the training rules,
  seeing danger in the slightest faults.
  
  (2) "When given food, whether coarse or refined, he eats it carefully,
  without complaining.
  
  (3) "He feels disgust at bodily misconduct, verbal misconduct, mental
  misconduct, at the development of evil, unskillful [mental] qualities.
  
  (4) "He is composed &amp; easy to live with, and doesn't harass the other
  monks.
  
  (5) "Whatever tricks or deceits or wiles or subterfuges he has, he
  shows them as they actually are to the Teacher or to his knowledgeable
  companions in the holy life, so that the Teacher or his knowledgeable
  companions in the holy life can try to straighten them out.
  
  (6) "When in training he gives rise to the thought, 'Whether the other
  monks want to train or not, I'll train here.'
  
  (7) "When going, he goes the straight path; here the straight path is
  this: right view, right resolve, right speech, right action, right
  livelihood, right effort, right mindfulness, right concentration.
  
  (8) "He dwells with his persistence aroused, [thinking,] 'Gladly would
  I let the flesh &amp; blood in my body dry up, leaving just the skin,
  tendons, &amp; bones, but if I have not attained what can be reached
  through human steadfastness, human persistence, human striving, there
  will be no relaxing my persistence.'"


From the Ajaniya Sutta (AN 3.94) - please read sutta for elaboration:


  "In the same way, a monk endowed with these three qualities is worthy
  of gifts, worthy of hospitality, worthy of offerings, worthy of
  respect, an unexcelled field of merit for the world. Which three?
  There is the case where a monk is consummate in beauty, consummate in
  strength, and consummate in speed.


From the Akkhama Sutta (AN 5.139) - please read sutta for elaboration:


  "In the same way, a monk endowed with five qualities is not deserving
  of gifts, deserving of hospitality, deserving of offerings, deserving
  of respect, nor is he an unexcelled field of merit for the world.
  Which five? There is the case where a monk is not resilient to sights,
  not resilient to sounds, not resilient to aromas, not resilient to
  flavors, not resilient to tactile sensations.
  
  "In the same way, a monk endowed with five qualities is deserving of
  gifts, deserving of hospitality, deserving of offerings, deserving of
  respect, an unexcelled field of merit for the world. Which five? There
  is the case where a monk is resilient to sights, resilient to sounds,
  resilient to aromas, resilient to flavors, resilient to tactile
  sensations.


From the Sotar Sutta (AN 5.140) - please read sutta for elaboration:


  "In the same way, a monk endowed with five qualities is deserving of
  gifts, deserving of hospitality, deserving of offerings, deserving of
  respect, an unexcelled field of merit for the world. Which five? There
  is the case where a monk is a listener, a destroyer, a protector, an
  endurer, and a goer.


From the Pathama Atthapuggala Sutta (AN 8.59):


  Monks, there are these eight individuals who are worthy of gifts,
  worthy of hospitality, worthy of offerings, worthy of reverential
  salutation, the unsurpassed field of merit for the world. Which eight?
  
  The one who has entered the stream, the one who has entered upon the
  course for the realization of the fruit of stream-entry, the
  once-returner, the one who has entered upon the course for the
  realization of the fruit of once-returning, the non-returner, the one
  who has entered upon the course for the realization of the fruit of
  non-returning, the arahant, the one who has entered upon the course
  for arahantship.