The spelling of "having stab" is quite straightforward when looking at its phonetic transcription /ˈhævɪŋ stæb/. The first syllable "hav" is pronounced with the short-a sound /æ/, followed by the vowel-i sound /ɪ/ in the second syllable "ing". The final syllable "stab" is pronounced with the short-a sound /æ/ and the consonant clusters /st/ and /b/. Therefore, the spelling of "having stab" should follow standard English pronunciation rules and include the letters "h-a-v-i-n-g s-t-a-b".