# not to have a wicked thought in your heart, saying

"not to think a wicked thought"

# The seventh year, the year of release, is near

It is implied that because the year of release will happen soon, the person thinking this will be reluctant to help a poor person since it is likely that the poor person will not have to pay him back. 

# the year of release, is near

"the year to cancel debts, will happen soon" 

# so that you will not be stingy in regard to your poor brother and give him nothing

"so that you are not stubborn and refuse to give anything to your fellow Israelite"

# cry out to Yahweh

"shout to Yahweh for help"

# it would be sin for you

"Yahweh will consider what you have done to be sinful"