If you mean his address to India on August 15, 1947 (the day of partition), well, there wasn't one: Mahatma Gandhi spent that day grieving over the Partition and was in prayer and fasting.

(The famous speech on the Midnight of Independence Day was delivered by Jawaharlal Nehru and was delivered in English.)

Here's the speech, in English, "on the eve of his last Fast", delivered on January 18, 1948, a mere 12 days before his assassination.