problem with WHERE clause matching on Arabic string
Try adding N before the text e.g.
select * from table_name
where name=N'arabic_text'
If you search for word احمد and your records have أحمد your query will return nothing even if you are using like '%احمد%' . It is better to use Full-Text search.
DECLARE @SearchWord nvarchar(100)
SET @SearchWord = 'احمد'
DECLARE @SearchString nvarchar(100)
SET @SearchString = 'FormsOf(INFLECTIONAL, "' + @SearchWord + '")'
--SET @SearchString = @SearchWord
SELECT Ar.[SuraID]
,Ar.[VerseID]
,Ar.[AyahText] as Arabic
,En.[AyahText] as English
FROM [QuranDb].[dbo].[ArabicQuran] Ar
join EnglishQuran En on En.ID=Ar.ID
where CONTAINS(ar.AyahText, @SearchString)
or CONTAINS(En.AyahText, @SearchString )
Here is other example using CONTAINSTABLE CONTAINSTABLE link
DECLARE @SearchWord nvarchar(100)
SET @SearchWord = 'لا اله الا الله '
DECLARE @SearchString nvarchar(100)
SET @SearchString ='ISABOUT ("'+ @SearchWord+'")'
SELECT K.RANK, Ar.AyahText,Ya.AyahText
FROM [ArabicQuran] AS Ar
INNER JOIN
CONTAINSTABLE([ArabicQuran], AyahText, @SearchString, LANGUAGE N'arabic' ) AS K
ON Ar.ID = K.[KEY]
join EnQuranYusufAli Ya on ya.ID=Ar.ID
order by k.RANK desc
select * from table_name
where name like N'%arabic_text%'
will work here