1. مَدُّ البَدَلِ The Exchange Medd
When will it be observed?

2. Has 4 states in terms of when it is observed
Medd Al-badal observed when …
continuing but NOT when STOPPING
مَدُّ البَدَل
Has 4 states in terms of when it is observed
continuing AND when stopping
ONLY at
BEGINNING of a word
stopping but NOT when CONTINUING

3. Stopping means the medd type changes from
(1)
Medd Al-badal is observed when continuing but NOT when STOPPING
For example:
﴿ وَإِنَّ لَهُ عِندَنَا لَزُلفَىٰ وَحُسنَ مَـَئابٍ ﴾
﴿ وَلَهُ ٱلجَوَارِ ٱلمُنشَـئاتُ ﴾
Stopping means the medd type changes from
مَدُّ البَدَل to عارِض للِسُّكون . عارِض للِسُّكون is stronger, hence overtaken مَدُّ البَدَل .

4. Medd Al-badal observed ONLY at BEGINNING of a word
(2)
Medd Al-badal observed ONLY at BEGINNING of a word
For example:
﴿ ٱئْذَن ﴾ ﴿ ٱؤْتُمِنَ ﴾ ﴿ ٱئْتُوني ﴾
Such words do not have medd al-badal as
they are. Medd al-badal occurs ONLY when we begin reading with these words.

5. To read such words look at the 3rd letter.
(2)
Medd Al-badal observed ONLY at BEGINNING of a word
To read such words look at the 3rd letter.
﴿ ٱؤْتُمِنَ ﴾
﴿ ٱئْتِنا ﴾
﴿ ٱئْتُوني ﴾
﴿ ٱئْذَن ﴾

6. Medd Al-badal observed ONLY at BEGINNING of a word
(2)
Medd Al-badal observed ONLY at BEGINNING of a word
If 3rd letter is Kesrah / fetha /
non original dhamma.
﴿ ٱئْذَن ﴾
﴿ ٱئْتِنا ﴾
﴿ ٱئْتُوني ﴾
 1) Put a kesrah on the 1st hamza.
2) Change 2nd hamza to a ي
﴿ إيْتِنا ﴾
﴿ إيتُوني ﴾
﴿ إيذَن ﴾

7. ﴿ ٱؤْتُمِنَ ﴾ (2) Medd Al-badal observed ONLY at BEGINNING of a word
If 3rd letter is an original dhamma.
﴿ ٱؤْتُمِنَ ﴾
 1) Put a dhammah on the 1st hamza.
2) Change 2nd hamza to a و
﴿ أُوتُمِنَ ﴾

8. Continuing means the medd type changes from
(3)
Medd al-badal is observed when stopping but NOT when CONTINUING
For example:
﴿ وَجَآءُوٓ أَبَاهُمۡ ﴾
Continuing means the medd type changes from
مَدُّ البَدَل to مدٌّ جائِزٌ مُنفَصِلٌ . مدٌّ جائِزٌ مُنفَصِلٌ is stronger, hence overtaken مَدُّ البَدَل when continuing.

9. Medd Al-badal is observed when continuing AND when stopping
(4)
Medd Al-badal is observed when continuing AND when stopping
For example:
﴿ ءَامَنَ ﴾
﴿ أَنبِئُوني ﴾
The hamza followed by the medd is either in the middle of the word or at beginning.