A friend in need is a friend indeed : অসময়ের বন্ধু প্রকৃত বন্ধুই; বিপদের বন্ধুই প্রকৃত বন্ধু;
Related Words
a friend in need is a friend indeed  afriendinneedisafriendindeed  See Words Also In
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Appropriate Prepositions
Abound with(ছেয়ে থাকা): They live in a region that abounds with oil.
Avail (oneself) of(সুযোগের স্বব্যবহার করা): I shall avail myself of the first trip to London tomorrow.
Bark at(ঘেউ ঘেউ করা): The dog is barking at the strange woman.
Guilty of (অপরাধী/দোষী): The convict was guilty of murder.
Sick of (ক্লান্ত): He is sick of this idle life.
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Idioms
At a snail's pace (very slowly – খুব ধীর গতিতে) The economy of Bangladesh is growing at a snail’s pace.
At least (in the lowest estimate- কমপক্ষে) He is the owner of thirty lakh taka at least.
Birds of a feather (persons of like disposition-একই পর্যায়ের লোক) Bird’s of a feather flock together.
Bear (a) grudge (bear hostility to— শত্রুতা বা বিদ্বেষ পোষন করা—V) We should not bear (a) grudge against our brethren.
Dead of night (মধ্যরাত্রি): The robbers broke into the house at dead of night.