I was reading surah azzariyaat 51 and ayah number 47 has the word biayyadin which has two YASS with sukun on them.

Question
Assalamualaykum
I was reading surah azzariyaat 51 and ayah number 47 has the word biayyadin which has two YASS with sukun on them. Is there a tajweed rule or any pronunciation rule to this word. JazakAllah Khayr

Answer
Wa alaikum assalam wa rahmatullahi wa barakaatuh
In aayah 51 of surah Adh-dhaariyaat the word has two ya' written in it.  One has the regular sukoon mark, where the other has a zero mark over it (as-sifr al mustadeer).  This extra ya' is from the writing of the Qur'an and although not pronounced has been copied and is part of the 'Uthmani writing of the Qur'an in which we are not allowed to change.  We pronounce only one of the ya' and do not pronounce the other. 
Wa iyyakum.