خري را كه به عروسي ميبرند براي خوشي نيست

Question

براي زحمت كشيدن است

Comments

 منظورش مثلا اینه:

ما رو برای کار کردن دعوت کردند وگرنه در حالت عادی، دعوتمون نمی‌کردند 

بِهِمون نیاز دارن که تحویلمون گرفتن وگرنه تحویل نمی‌گرفتن و ما نباید فکر کنیم حتما به ما لطف داشتن

باید دید معادل انگلیسی داره یا نه

Answer 1

Literal: They take the ass to the wedding only in order to load it.

ضرب المثلهای فارسی انگلیسی حیم (1965)

Comments

I think this is not the case. This proverb cannot be found in any famous on-line dics or web-pages if you google it.

I think we cannot rely on that ref.

Answer 2

How about it's no picnic? 

When you say something is no picnic, you think it's difficult or unpleasant to do unlike what you or other people might have expected. Also we say it to assure someone there was/is/will be nothing easy or enjoyable to do a specific task. 

'So let me assure you it's no picnic to be in charge of this land...' Mccarthy's Governing Takes Brain, the song ;-)

Answer 3

All lay loads on a willing horse.

A willing horse is a term which is used to describe people who are sincere and committed workers and are ready to do all the work given to them. The term originated from earlier days when people used horses as their beasts of burden to carry loads. The horses were loaded indiscriminately and still they would carry the load without disobeying their master.

http://www.english-for-students.com/all-lay-loads-on-a-willing-horse.html