TL;DR: No. Your bitcoin-core pass-phrase cannot be used to recover your bitcoin.
i was told the need of a private key
If you have the private key, you can recover access to your bitcoin.
If you have a recovery phrase and know which bitcoin wallet you used, you can recover the private key and recover access to your bitcoin.
Otherwise those bitcoin are gone forever.
i promise a reward to anyone who helps me out?
Expect to receive lots of email from scammers and very convincing professional conmen.
Don't give anyone your private-key or your recovery-phrase. The only circumstances you should ever do that is in front of a lawyer paid by you with proof of the helper's identity and a signed contract in her hand. Otherwise you will lose even more money.
People can help you without knowing your private-key or recovery-phrase. If they say they can't help you without those things, they are conmen.
If i installed the latest version of Bitcoin core with the same wallet phrase will i see that old address back with the balance.
Any suggestions would be appreciated
Are all of the words in your passphrase in the BIP39 list? If so it is a recovery-phrase not a pass-phrase. If so it would be associated with a different type of wallet than the "bitcoin core" wallet.
If so, download a wallet application that uses BIP39 and try using your recovery phrase in it. Be very careful not to download malware. Start with wallets that don't require an online service to work.
Bitcoin core "passphrase"
Note that in the "bitcoin core" wallet, the Passphrase is used to encrypt your wallet. It is not a recovery phrase. You cannot recover access to your bitcoins using only the pass-phrase of a lost wallet.
Importing private keys into a new "bitcoin core" wallet
- Run Bitcoin-Core
- Select Help (to the right of Settings)
- Select Debug Window
- Select Console
- If you encrypted your wallet, unlock it by entering
walletpassphrase "YourLongPassphrase" 600 next to the > input box
- Next to the > input box type
importprivkey <bitcoinprivkey> (Note that the private key must not have spaces, remove them if they are included in your backup)
Note that the 'bitcoin core' wallet does not use a recovery phrase. You cannot recreate your private key from a recovery phrase using bitcoin core. The only "pass-phrase" used with bitcoin core grants access to the wallet, it is not the private key and cannot be used to recreate the private key.
Without the private key, the bitcoins are gone forever.